Buick Regal 2018-present Electrical System Bolt Torque Specifications & Ground Points
Buick Regal 2018-present

Buick Regal 2018-present Electrical System Bolt Torque Specifications

Detailed torque specifications for various electrical component bolts on the 2018-Present Buick Regal. Includes values in Newton-meters (Nm) and foot-pounds (ft-lbs).

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Battery System

Components related to the vehicle's battery, including terminals and mounting.

1

Battery Terminal Clamps

M8 (estimated)
Torque Value
9.17 ft-lbs (12.4 N·m)
Important Notes
Estimated value based on similar General Motors battery terminal specifications. Secures battery cable terminals to the battery posts for proper electrical contact. Loose terminals cause starting issues, and corroded connections. Ensures proper power to the car's electrical system.
2

Battery Hold-Down Bolts

M8 (estimated)
Torque Value
11 ft-lbs (14.9 N·m)
Important Notes
Estimated value based on industry standards. Secures the battery to the battery tray. Prevents battery from moving during operation, preventing shorts and potential damage. Loose battery can cause a short, damage the battery or the electrical system.

Starting Charging System

Components related to the engine starting and charging system.

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Value based on similar GM specifications for M10 starter motor bolts. Secure the starter motor to the engine block. Proper torque is vital for alignment and engagement with the flywheel. Critical for reliable starting. Loose bolts could cause starter to break or jam, not making contact with the flywheel.
2

Alternator Mounting Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Value based on similar GM specifications for M8 alternator bolts. Secure the alternator to the engine block or bracket. Proper torque ensures proper tension on the belt and electrical ground. Loose alternator can cause a belt failure and electrical charging system malfunction.

Grounding System

Bolts related to grounding connections within the vehicle.

1

Ground Strap Connection Bolts (Body/Chassis to Engine/Battery/Frame)

M6 x 1.0
Torque Value
6.67 ft-lbs (9 N·m)
Important Notes
Estimated value based on industry standards. Essential for proper electrical grounding of all electrical components. Poor ground connections cause many electrical system problems. Ensures proper current flow and reduces electrical noise.

Control Modules

Mounting bolts for various control modules in the vehicle.

1

Engine Control Module (ECM) Mounting Bolts

M6 x 1.0
Torque Value
5.83 ft-lbs (8 N·m)
Important Notes
Estimated value based on similar models. Secures the ECM to its mounting point on the vehicle. Proper torque prevents vibration damage to the sensitive electronics and ensures good electrical contact. Too tight can damage the module, too loose can cause problems with connection and damage to the system
2

Transmission Control Module (TCM) Mounting Bolts

M6 x 1.0
Torque Value
5.83 ft-lbs (8 N·m)
Important Notes
Estimated value based on similar models. Secure the TCM to the transmission or its mounting point. Ensures proper operation of the electronic transmission control system. Too tight can damage the module, too loose can cause problems with connection and damage to the system
3

Body Control Module (BCM) Mounting Bolts

M6 x 1.0
Torque Value
5.83 ft-lbs (8 N·m)
Important Notes
Estimated value based on similar models. Secures the BCM within the vehicle. Proper torque ensures no vibration-induced damage and proper connections. Too tight can damage the module, too loose can cause problems with connection and damage to the system
4

ABS Module Mounting Bolts

M6 x 1.0
Torque Value
7.42 ft-lbs (10 N·m)
Important Notes
Estimated value based on General Motors ABS module mounting bolt standard. Secures the Anti-lock Braking System module to the vehicle. Important for safe braking and anti-skid operation. Too tight can damage the module, too loose can cause problems with connection and damage to the system

Lighting System

Mounting bolts for headlights and tail lights.

1

Headlight Assembly Mounting Bolts

M6 x 1.0
Torque Value
5.17 ft-lbs (7 N·m)
Important Notes
Estimated value based on similar models. Secures headlight housings to the vehicle's body or frame. Proper torque prevents vibration and ensures proper light aiming. Too tight can cause damage to the housing, too loose and it will vibrate or not seat properly
2

Tail Light Assembly Mounting Bolts

M6 x 1.0
Torque Value
5.17 ft-lbs (7 N·m)
Important Notes
Estimated value based on similar models. Secures tail light housings to the vehicle. Prevents light from vibrating, or falling off. Also provides a secure waterproof seal. Too tight can cause damage to the housing, too loose and it will vibrate or not seat properly

Electrical Distribution

Mounting bolts for the fuse box and relays.

1

Fuse Box Mounting Bolts

M6 x 1.0
Torque Value
5.83 ft-lbs (8 N·m)
Important Notes
Estimated value, industry standard for electrical components. Secure the fuse box to the vehicle body. This helps to prevent movement or damage from vibration.
2

Relay Mounting Bolts/Screws

M4 (estimated)
Torque Value
2.92 ft-lbs (4 N·m)
Important Notes
Estimated value based on industry standard for small electrical components. These screws secure relays to their mounting brackets. Over-tightening could damage the plastic housing.

Power Accessories

Mounting bolts for power window motors and door lock actuators.

1

Power Window Motor Mounting Bolts

M6 x 1.0
Torque Value
7.42 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar models. Secures the power window motors inside the door panel.
2

Power Door Lock Actuator Mounting Bolts

M6 x 1.0
Torque Value
7.42 ft-lbs (10 N·m)
Important Notes
Estimated value based on similar models. Secure the door lock actuators inside the door panel. Ensures safe and reliable locking system operation.

Wiper System

Mounting bolts for the wiper motor.

1

Wiper Motor Mounting Bolts

M6 x 1.0
Torque Value
5.83 ft-lbs (8 N·m)
Important Notes
Estimated value based on similar models. Secures the wiper motor to the cowl or body structure. Essential for proper and reliable wiper operation, safety in inclement weather

Interior Components

Screws for interior lighting and steering column module.

1

Interior Lighting Fixture Mounting Screws

M3-M5 (Varies)
Torque Value
1.67 ft-lbs (2.26 N·m)
Important Notes
Estimated value based on industry standard for small fasteners. Varies based on screw size (20-45 in-lbs / 2-5 N·m). Secures interior lights in place, prevents rattle and ensures proper connection.
2

Steering Column Module Bolts

M6 x 1.0
Torque Value
6.67 ft-lbs (9 N·m)
Important Notes
Estimated value, based on similar module mounting. Secures the steering column module which contains various electrical sensors and controls, safety-related. Over-tightening can damage module, too loose and it will rattle or misfunction.
3

Radio/Infotainment Unit Mounting Bolts

M5 x 0.8
Torque Value
5.17 ft-lbs (7 N·m)
Important Notes
Estimated value based on similar models. Secures the head unit in the dashboard. Prevents vibration and potential damage to connections.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

Why is it important to use the correct torque specifications when tightening electrical connections?

Using the correct torque specifications is crucial for reliable electrical connections. Under-tightening can lead to a loose connection, resulting in increased resistance, heat generation, and potential circuit failure. Over-tightening can damage the component, strip threads, and also cause connection issues. Consistent torque ensures optimal electrical conductivity and mechanical integrity.

Q2

Can I use a general torque setting if I don't know the specific one for my Buick Regal's electrical component?

No, you should never use a general torque setting for specific electrical components. Torque specifications are carefully calculated by engineers based on the material, size, and function of the connector or component. Using an incorrect torque can lead to premature failure, damage, or unsafe conditions. Always refer to the vehicle’s service manual or a reputable source for the specific torque required for your vehicle and component. Using a generic setting, for example, might under tighten a critical ground point and cause intermittent electrical issues.

Q3

What happens if I overtighten a bolt on an electrical component?

Overtightening an electrical bolt can cause several problems. The most common is stripping the threads of the bolt or the receiving component, which will require replacement. Overtightening can also damage the internal structure of the component or its housing, potentially leading to short circuits or impaired functionality. For example, overtightening a bolt on the body control module (BCM) could crack the housing and cause water ingress, leading to expensive repairs.

Q4

Should I use any specific type of lubricant on electrical bolts?

Generally, you should avoid using lubricants on electrical bolts unless specifically recommended by the vehicle's service manual. Certain lubricants can act as insulators, impeding electrical conductivity. In some cases, specific anti-seize compounds may be recommended, but they should be applied sparingly and only when instructed. If in doubt, always clean the bolt and receiving thread.

Q5

How do I ensure accurate torque application when tightening electrical connections?

Using a properly calibrated torque wrench is essential for accurate torque application. Ensure you are using the correct range of the torque wrench for the bolt in question. Use a smooth and controlled tightening motion and avoid jerking or abrupt movements. Always double-check your work to ensure all connections are tightened to the specified values. If in doubt, have a qualified mechanic verify your work.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench (3/8" Drive)

A calibrated torque wrench is essential for accurately tightening electrical connections to specified torque values.

  • Adjustable torque settings
  • Click-type or digital readout
Learn more

Torque Wrench (1/4" Drive)

Smaller drive torque wrench for accessing lower torque requirements.

  • Fine adjustment for lower torque
  • Compact size
Learn more

Socket Set (Metric)

A set of metric sockets is required to fit the various bolt and nut sizes found in the Buick Regal's electrical system.

  • Various sizes to fit multiple bolt heads
  • Durable construction
Learn more

Extension Bars (3/8" and 1/4")

Extension bars are needed to reach bolts in recessed or hard-to-access areas within the engine bay and dashboard.

  • Various lengths for flexibility
  • Secure connection to sockets
Learn more

Digital Multimeter

Used for checking electrical circuit continuity and voltage, ensuring connections are good before and after torquing.

  • Voltage, current, and resistance measurements
  • Continuity testing
Learn more

Pick Tools

Used for prying small electrical components or accessing hard-to-reach areas.

  • Assorted sizes and shapes
  • Durable material
Learn more
Service Procedures

Battery Terminal Connection Torque Procedure

Procedure for properly torquing the positive and negative battery terminal connections.

  • Disconnect the negative battery terminal.
  • Clean battery terminals and connectors thoroughly.
  • Position terminals and connectors.
  • Torque terminal bolt to the specification found in the service manual or the label on the battery bracket.
  • Reconnect the negative battery terminal.
View full procedure

Ground Wire Connection Torque Procedure

Procedure for tightening ground wires to the vehicle chassis or engine block.

  • Locate the ground wire connection points.
  • Clean connection points of any corrosion.
  • Securely position ground wire and bolt.
  • Torque ground bolt to the manufacturer's specified torque.
  • Verify continuity using a multimeter.
View full procedure

Fuse Box Terminal Connection Torque Procedure

Procedure for torquing down fuse box terminal connections.

  • Disconnect power to the fuse box, if necessary.
  • Inspect all terminals, ensure correct placement and good condition
  • Tighten fuse box terminal screws to the manufacturer's specified torque.
  • Verify tightness using a calibrated torque wrench
View full procedure
Technical Service Bulletins

Excessive Resistance in Battery Terminal Connections

2019-07-15

Some 2018-2019 Buick Regal models may experience higher than normal resistance at battery terminal connections due to poor factory torque. This can cause intermittent starting issues and voltage drops.

2018-2019

Resolution: Remove and clean the battery terminals. Reinstall using specified torque. Verify connections with multimeter. Use dielectric grease on terminals.

Ground Wire Corrosion and Resulting Electrical Issues

2020-03-22

Corrosion found at ground wire connections leading to electrical system performance issues including but not limited to headlight flickering and power window failure.

2018-2020

Resolution: Remove ground wires, clean all connection points to bare metal, and reattach using factory torque specifications. Apply anti-corrosion spray after completion.

Fuse Box Connector Pin Issues

2021-11-01

Reports of poor connections at the fuse box resulting in random electrical system failures. Could be due to improper torque on the connector pins or pin damage.

2018-2021

Resolution: Inspect fuse box connectors for damage. Check torque on terminal screws. If required, replace damaged terminal connectors and re-torque to specification.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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