Dodge Monaco Brake Light Switch Guide: 1971-1978
Solve common brake light problems in your classic Monaco with the right replacement switch.
- Most brake light problems on this car are due to adjustment, not part failure. Always try adjusting the switch on its slotted bracket first.
- This is a critical safety part. Driving with brake lights that are always on or never on is extremely dangerous.
- Access is the hardest part of the job; consider removing the driver's seat for much easier access to the switch under the dash.
- If a new switch doesn't fix the issue, investigate the turn signal switch, as the brake light circuit passes through it.
Is Your Dodge Monaco Brake Light Switch Failing?
A faulty brake light switch is a serious safety issue. The most common problems on these classic Mopars are either the brake lights not turning on at all, or them staying on and draining your battery. Before you buy a new part, it's important to know that many issues are caused by poor adjustment, not a broken switch. Over 50 years, brackets can get bent and parts can shift. However, if the switch itself is confirmed to be bad, a replacement is necessary.
Symptoms of a Bad Brake Light Switch
- Brake Lights Stay On: The most common issue. The switch is no longer being fully depressed when the brake pedal is at rest. This could be a failed switch or, more likely, an adjustment issue.
- Brake Lights Don't Turn On: The switch has failed internally and no longer completes the circuit, or it is so far out of adjustment that the pedal movement doesn't activate it. This is a critical safety failure.
- Intermittent Brake Lights: The lights may flicker or only work when you press the pedal very hard. This often points to a worn-out switch or a loose connection.
Check Adjustment First!
Many brake light issues on 1970s Mopar C-bodies are not due to a failed part, but simple mis-adjustment. The switch is mounted on a bracket with a slotted hole. Loosening the mounting bolt allows you to slide the switch closer to or further from the pedal arm. Often, this is all that is needed to fix the problem.
Choosing the Right Aftermarket Switch
For a vehicle of this era, New Old Stock (NOS) OEM parts are extremely rare and expensive. Your realistic options are new aftermarket switches. Quality can vary, and some owners on forums report that cheap switches can fail mechanically. Choosing a reputable brand can save you the hassle of doing the job twice.
| Brand Tier | Available Brands | Typical Price | Our Take |
|---|---|---|---|
| Standard Replacement | Standard Ignition | $15 - $42 | Standard Motor Products (SMP) is a long-standing brand known for producing reliable aftermarket components. For a simple part like this, their switch is a dependable choice that should meet or exceed the original's performance. |
| Economy | Skyward | $5 - $15 | Skyward is a budget-friendly option. While it will get the job done, the long-term durability may not match that of a premium brand. Given the awkward location of the switch, spending a few extra dollars for a better part can be worth it to avoid a repeat installation. |
Frequently Asked Questions (FAQ)
How hard is it to replace the brake light switch myself?
The replacement itself is simple, but access is difficult. The switch is located up under the dashboard, and you will be working in a cramped space. Many owners recommend removing the four nuts that hold the driver's seat and taking it out of the car to give yourself more room to lie on your back and see what you're doing. The switch is typically held to its bracket by a clip or a single bolt.
My new switch is installed, but the lights still stay on. What's wrong?
This is almost always an adjustment issue. The switch needs to be positioned so that the pedal arm fully depresses the plunger when your foot is off the brake. Loosen the mounting bracket and slide the switch until the lights go out, then tighten it down. Ensure the lights come on with only a small amount of pedal travel.
Could something else cause my brake lights to fail?
Yes. On these Mopars, the brake light power runs through the turn signal switch in the steering column. A faulty turn signal switch can interrupt the power to the brake lights. If a new, properly adjusted brake light switch doesn't solve the problem, the turn signal switch is the next component to inspect. Also, always check your fuses and bulbs first.
Are there any recalls for the 1971-1978 Monaco brake light switch?
No. Searches of the NHTSA database show no safety recalls or technical service bulletins (TSBs) specifically for the brake light switch on the 1971-1978 Dodge Monaco. Any recalls found online are for much newer vehicles or different part manufacturers not relevant to the original factory equipment.
Technical Specifications
OEM Part Numbers: 3488515 2631048 3764047
Mechanical plunger-style switch mounted on the brake pedal support bracket.
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.