Skip the auto shop - Our mechanics make house calls

Q: No brake lights 1990 Mercury Grand Marquis

asked by on

I replaced brake switch and still no brake lights, all other lights work (hazards, tail lights , blinkers etc.) Whats wrong

My car has 8400 miles.

A: Hi there - check the fuses for the brake li...

Hi there - check the fuses for the brake lights, the brake light bulbs, and the ground for the brake lights (should be OK since other lights work, but....). If these check out correctly, check for power to the brake light switch -ignition in the "Run" position - then check for 12v on the "outbound" side of the switch with the brake pedal pressed. If there is 12 volts leaving the brake light switch, there is a wiring problem going to the brake lights themselves. If you need assistance tracking this problem down, I would suggest a wiring inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car overheating and leaking

It sounds like you have a coolant leak. The most common coolant leak I've seen on your vehicle make and model is the intake manifold. The intake manifold is made of plastic and cannot withstand high temperatures like metals can....

Q: my battery kept draining until i bought a new alternator and battery. i have tightened the belt on the alternator but it still die

Hi there. The best way to diagnose why a battery would constantly drain is to review it's job and how it is recharged. The battery is responsible for powering all electrical systems until the vehicle is started. At this point,...

Q: Brake light malfunction and ABS light has been on for months.

Check the brake light switch on the brake pedal and see if its loose on the contact pin. If the pin feels loose, then the switch needs replaced. For the ABS light to be on, there could be an issue...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.