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Lou P.
Lou P., ASE Certified Technician
Category: Jeep
Satisfied Customers: 3726
Experience:  I Have knowledge in almost all car lines and can help with general questions and more!!!!!
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Why won't my brake lights work when my headlights are on

Customer Question

Why won't my brake lights work when my headlights are on for my 2002 grand jeep lardo
Submitted: 9 months ago.
Category: Jeep
Customer: replied 9 months ago.
When my headlights are off I have 1 brake light on driver side when there on I don't have no Brake lights at all but do have 1 running light on passenger side
Expert:  Lou P. replied 9 months ago.

Hello, sounds to me like there is a ground issue, BUT have you checked the bulbs first to make sure they were not burnt?

Customer: replied 9 months ago.
I checked all bulbs the 1 at the top of hatch is blown the others r good
Expert:  Lou P. replied 9 months ago.

ok, did you check resistance to ground on the socket to see if you had a good ground? how good are you at electrical?

Customer: replied 9 months ago.
I honestly don't kno what I'm doing I'm so how do I check the resistance
Expert:  Lou P. replied 9 months ago.

ok, give me a moment , let me check a wiring diagram.

Customer: replied 9 months ago.
Anything yet
Expert:  Lou P. replied 9 months ago.

Ok so on each brake light socket there is a white wire with a tan stripe. That wire should have power when pressing the brakes. Check to see if it does.

SORRY I thought that message came through !

Expert:  Lou P. replied 9 months ago.

any thing yet? did you test those wires?

Customer: replied 9 months ago.
No checking today
Expert:  Lou P. replied 9 months ago.

ok, just wanted to let you know i am here when you are ready and i did not forget about you. Lou

Customer: replied 9 months ago.
Thanks I'll hit u when I check it out and just to let u kno I put a blub in the middle hatch uptop and my running lights came on but when I press the brakes just the middle gets bright and the driver side brake light goes out when I press brakes
Expert:  Lou P. replied 9 months ago.

ok that usually indicates a bad ground signal, so we start by testing for the power signals then we will move to the ground . and i appreciate the info, the more the merrier.

Customer: replied 9 months ago.
Ok I'll let u kno when I check them
Expert:  Lou P. replied 9 months ago.

ok, have a good weekend. no need to reply until you are ready :)