A Comprehensive Guide to the 1981-1985 Chevrolet Blazer Back Up Light Switch
Everything you need to know about diagnosing and replacing the reverse light switch on your classic K5 Blazer.
- The back up light switch is a critical safety part; replace it if it's faulty.
- On automatic Blazers, the switch is part of the Neutral Safety Switch on the steering column; on manuals, it's on the transmission.
- Symptoms include no reverse lights, lights that stay on, or flickering lights.
- Always check bulbs, fuses, and grounds before condemning the switch.
Is Your Back Up Light Switch Failing?
A faulty back up light switch is more than an inconvenience; it's a safety hazard that can prevent others from knowing your intentions. Because this part can fail from age and normal wear, it's a common replacement item on a classic Blazer. Recognizing the symptoms early is key to staying safe on the road.
Symptoms of a Bad Back Up Light Switch
- No Reverse Lights: The most obvious sign is when your reverse lights don't turn on at all when you shift into reverse. Before blaming the switch, always check the bulbs and the 'TURN B/U' fuse first.
- Lights Stay On: The switch can fail in the 'on' position, causing your reverse lights to stay lit continuously, which can confuse other drivers and quickly burn out your bulbs.
- Flickering or Intermittent Lights: If the lights flicker or only work when you jiggle the shifter, it often points to a worn or misaligned switch. On automatic models, this may mean the switch on the steering column needs adjustment.
- No-Start Condition (Automatics Only): Since the back up light function is part of the Neutral Safety Switch on automatic models, a total failure of this component can prevent your Blazer from starting.
Choosing the Right Aftermarket Switch
For a vehicle like the 1981-1985 Blazer, original OEM parts from Chevrolet are virtually non-existent. The market consists of new aftermarket parts, which are widely available and affordable. While availability can sometimes be inconsistent for classic vehicles, several reputable brands manufacture these switches.
Aftermarket Brand Tiers
| Tier | Brands | Notes |
|---|---|---|
| Better | ACDelco, Standard Motor Products (SMP) | ACDelco is a GM-owned brand and often the original equipment supplier, offering excellent fit and reliability. Standard Motor Products is a highly regarded aftermarket manufacturer known for quality electrical components that meet or exceed OEM specs. |
| Good | Duralast, Lectric Limited | These brands offer a good balance of quality and value. They are reliable replacements for daily driver vehicles and are often readily available at major auto parts stores. |
Pro Tip: The location of your switch depends on your transmission. Automatic models have a combined Neutral Safety / Back Up Light switch on the steering column inside the cab. Manual transmission models have a dedicated switch on the transmission housing itself. Be sure to order the correct part for your specific setup.
How Much Does a New Back Up Light Switch Cost?
Replacing this switch is an inexpensive repair. The part itself is affordable, and if you have it done professionally, the labor is minimal.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $15 - $50 |
| Shop Labor | $100 - $150 |
| Total Estimated Cost | $115 - $200 |
Cost estimates are for reference only and may vary based on your location, vehicle condition, and the specific part used.
Frequently Asked Questions
Where is the back up light switch on my Blazer?
If you have an automatic transmission with a column shifter, the switch is mounted to the base of the steering column, under the dashboard near the firewall. If you have a 4-speed manual transmission, the switch is threaded into the side of the transmission case.
My reverse lights don't work. Is it definitely the switch?
Not necessarily. Always start with the simple things: check for burnt-out bulbs, inspect the fuse labeled 'TURN B/U' in the fuse panel, and check for corroded bulb sockets or bad grounds at the tail lights. If those are all good, the switch is the next likely culprit.
Can I replace the back up light switch myself?
Yes, this is a DIY-friendly job for most home mechanics. For automatic models, the switch is accessible under the dash and typically held on by two screws. It may require slight adjustment to align perfectly with the gear selector positions. For manual models, it simply unscrews from the transmission, similar to a sensor.
Are there any recalls for the back up light switch on my Blazer?
No, there are no recalls from the National Highway Traffic Safety Administration (NHTSA) for the back up light switch or neutral safety switch on the 1981-1985 Chevrolet Blazer.
Technical Specifications
OEM Part Numbers: 1994255 1994247 11516116 22514861
Varies by transmission type. Automatic transmission models use a multi-pin switch combined with the neutral safety function mounted on the steering column. Manual transmission models use a two-pin plunger-style switch mounted on the transmission case.
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.
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