1982-1990 GMC S15 Back Up Light Switch Guide and Part Review
If your reverse lights are out, the problem is often this simple, inexpensive switch located on your transmission.
- The most common symptom of failure is reverse lights not working when the bulbs and fuse are good.
- This is a simple DIY repair; the switch is located on the driver's side of the manual transmission.
- ACDelco and Standard Ignition are top-quality brands for this part.
- Before ordering, confirm you have a manual transmission, as automatic models use a different part.
Is Your Back Up Light Switch Failing?
A bad back up light switch is more than an annoyance; it's a safety hazard. Other drivers and pedestrians can't tell you're reversing, which is especially dangerous in parking lots. It can also get you a ticket. Before you assume the switch is bad, check two other things first: the reverse light bulbs and the fuse. If the bulbs are good and the fuse is intact, the switch is the most likely culprit. 🎬 Watch: 5 common reasons your reverse lights aren't working Sometimes, a bad switch can even cause the fuse for the turn signals to blow.
Symptoms of a Bad Back Up Light Switch
- Reverse lights do not turn on: This is the most common sign of a failed switch.
- Reverse lights stay on: The switch can fail in the 'on' position, leaving the lights on even when you're not in reverse. This will drain your battery.
- Lights work sometimes: If you have to jiggle the shifter to get the lights to work, the switch is worn out and failing.
Manual vs. Automatic Transmission
This guide is for the back up light switch on manual transmission S15 trucks, which is located on the transmission case. Trucks with an automatic transmission use a combination Neutral Safety / Back Up Light Switch located on the steering column, which is a different part.
Choosing the Right Aftermarket Switch
For a simple part like this, you don't always need to pay for a part from the dealer. Aftermarket options offer good quality and value. Here’s a breakdown of the brands available.
Brand Tiers for Your S15
- Premium Aftermarket (Best): ACDelco & Standard Ignition
- ACDelco is General Motors' own parts brand, and their products are considered original equipment (OE) quality. For an older truck, an ACDelco part is as close to factory as you can get. Standard Ignition (Standard Motor Products) is a top-tier aftermarket manufacturer with a long-standing reputation for making reliable electrical parts that meet or exceed OEM quality. You can trust either of these brands for a long-lasting repair.
- Value Aftermarket (Good): Replacement
- The "Replacement" brand represents a category of budget-friendly parts. These switches are designed to be a direct fit and function like the original, but at a lower cost. For a simple switch on an older truck, this can be a perfectly acceptable option to get your lights working again without spending much.
Pro Tip: Check the Connector
Before ordering, take a quick look under your truck at the switch's electrical connector. Over decades, wiring can get brittle and corroded. If the connector or wires look damaged, it's a good idea to order a new pigtail connector along with your switch to ensure a solid connection.
Cost of Replacing Your Back Up Light Switch
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Switch | $26.28 - $40.77 |
| New OEM Switch (GM/ACDelco) | $20 - $35 |
| Shop Labor | $62 - $95 |
Frequently Asked Questions
Where is the back up light switch located on a 1982-1990 GMC S15?
For manual transmission models, the switch is screwed into the driver's side of the transmission housing. 🎬 See this video to help locate the switch on the transmission You will need to safely get under the truck to see and access it.
Can I replace this switch myself?
Yes, this is a good DIY job for a beginner. The process involves safely lifting and supporting the truck, unplugging the electrical connector, and using a wrench to unscrew the old switch and install the new one. The most difficult part is often working in the tight space around the transmission.
🎬 Watch this step-by-step guide to replacing the switch yourselfWhat tools do I need to replace the switch?
You will need basic hand tools, including a wrench or socket set. The switch typically has a 7/8" hex head. Sometimes a standard socket is too long to fit, so a shorter sensor socket or a modified socket may be needed to get it out. You will also need a jack and jack stands to safely lift the vehicle.
Do I need to drain the transmission fluid?
No. The back up light switch is located high enough on the transmission case that you should not lose any significant amount of fluid when you remove it. Have your new switch ready to install quickly just in case a small amount of fluid weeps out.
Helpful Videos
Technical Specifications
OEM Part Numbers: 14069600
Thread Size: M16 x 1.5, Connector: 2-Pin Female
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 S15:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Back Up Light Switch Failing?
- Symptoms of a Bad Back Up Light Switch
- Manual vs. Automatic Transmission
- Choosing the Right Aftermarket Switch
- Brand Tiers for Your S15
- Pro Tip: Check the Connector
- Cost of Replacing Your Back Up Light Switch
- Frequently Asked Questions
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