1986-1991 GMC C1500 Suburban Back Up Light Switch Guide
Having trouble with your reverse lights? This guide covers the common issues and replacement for your classic Suburban.
- The most common symptom of failure is reverse lights not working at all.
- On automatic models, the switch is part of the neutral safety switch on the steering column.
- An aftermarket replacement from a brand like Standard Ignition is a reliable and cost-effective solution.
- Before replacing the switch, check for simple issues like burnt-out bulbs, bad fuses, or poor adjustment.
Is Your GMC Suburban's Back Up Light Switch Failing?
On a classic truck like the 1986-1991 GMC C1500 Suburban, electrical parts can wear out. The back up light switch is a common point of failure. The most obvious sign of a problem is when your reverse lights don't turn on when you shift into reverse. You might also notice them flickering or staying on even when you're not in reverse. Sometimes, wiggling the shifter used to make the lights work, but now it doesn't help anymore. This indicates the switch is likely worn out or out of adjustment.
Safety First
Working reverse lights are a legal requirement and a critical safety feature. Driving without them increases the risk of an accident, especially when backing up at night or in crowded areas. If your lights are out, it's best to get the issue diagnosed and fixed promptly.
Choosing a New Aftermarket Back Up Light Switch
For a vehicle from this era, finding a new original equipment (OEM) part from GM can be difficult or impossible. The good news is that reliable aftermarket brands like Standard Ignition produce quality replacements that meet or exceed original specifications. An aftermarket switch is often the only practical choice and provides a cost-effective and dependable solution. Standard Ignition is a well-known manufacturer that performs 100% testing on its switches to ensure performance.
OEM vs. Aftermarket Quality
For a simple component like a back up light switch on a 30+ year-old truck, a quality aftermarket part from a reputable brand like Standard Ignition is a perfectly acceptable and reliable option. These parts are designed as direct-fit replacements, ensuring a straightforward installation. Given the age of the vehicle, the focus should be on a new, functional part rather than tracking down a potentially non-existent new OEM part.
Locating and Replacing the Switch
The location of the switch depends on your transmission type:
- Automatic Transmission: The back up light switch is part of the neutral safety switch. You can find it mounted on the base of the steering column, inside the cab, down by the pedals. It is often a crescent-shaped plastic part.
- Manual Transmission: The switch is typically located on the transmission itself.
In some cases, the problem might not be the switch itself, but its adjustment. For automatic models with the column-mounted switch, it has adjustment teeth that allow it to be moved slightly to ensure it engages correctly when you shift into reverse. If a new switch is installed and the lights still don't work, check the bulbs, fuses, and wiring grounds first.
Pro Tip: Adjustment Might Be All You Need
Before replacing the switch on an automatic model, try adjusting it. With the emergency brake on and the shifter in Neutral, you may be able to reach under the dash and rotate the switch housing slightly. Sometimes this is enough to get the lights working again, although if the switch is worn, this may only be a temporary fix.
Frequently Asked Questions (FAQ)
What are the signs of a bad back up light switch?
The most common signs are reverse lights not turning on at all, staying on constantly, or flickering. You may have also noticed that you used to be able to wiggle the shifter to get them to work, but that trick has stopped working.
Where is the back up light switch on my 1986-1991 Suburban?
If you have an automatic transmission, the switch is part of the neutral safety switch assembly located at the base of the steering column inside the cab. For manual transmissions, the switch is mounted on the transmission case.
Is it hard to replace the back up light switch?
For most DIY mechanics, it is a relatively easy job. The column-mounted switch can be accessed from inside the cab without special tools. The transmission-mounted switch may require lifting the vehicle to gain access from underneath. The difficulty is low, and it can typically be done in under an hour.
Are there any recalls for this part?
Searches of the National Highway Traffic Safety Administration (NHTSA) database did not find any specific recalls for the back up light switch on the 1986-1991 GMC C1500 Suburban. Any recalls found were for different models, years, or different types of switches.
Technical Specifications
OEM Part Numbers: 14014559
For automatic transmission models, the switch is integrated with the neutral safety switch. For manual transmission models, it is a separate screw-in switch on the transmission case.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC C1500 Suburban: