By now u probably paid for a diagnosis already. I don't know what relay was being referred to but u should have that in your diagnosis.
Relay does not sound right to me. Use a voltmeter or test light to probe the fuse box. Is there power at the headlight fuse? Problem may be in the power box itself. I don't believe there is any relay that runs all the lights.
SOURCE: 1989 Jeep Cherokee - Electrical Problem - horn, brake lights, blinkers, radio/cd...
There could be a fusible link under the hood off the starter relay that is burnt out.
SOURCE: 1989 Jeep Cherokee - Electrical Problem - horn, brake lights, blinkers, radio/cd...
I think I have found the problem. When I wiggle the ignition switch the turn signals and radio go on and off so I feel the issue is in the ignition switch. From what I understand the actual electronics for the switch are at the base of the sterring column behind the lower dash panel and is connected by a rod that may need adjusting.
SOURCE: 1995 Jeep Grand Cherokee Limited - flasher relay location
More than likely you have a bad ground. Under the rear of the vehicle, behind the rear bumper there will be a few wires running to a bolt in the frame (left side i think) Check that no wires are loose or boken. Also if you have a trailer wiring harness, check to see if it has not been damaged. Let me know if this helps :)
SOURCE: I have a 1999 Jeep Grand Cherokee Laredo - One Brake Light
First, I want to say thank you for the info, you saved me money and aggravation. Second it took mea little while to figure out what contact I was looking for. So I would like to provide a little more detail to make it easier for others in the future.
This is the corrective method for your brake lights not working when your headlights are on(2000 Jeep Cherokee Larado).
1) The cause of the problem is heat from the bulb.
2) Remove the light assembly as if you were going to change a bulb.
3) Turn the socket and remove it from the taillight assembly and set it aside(check to be sure your bulb is not burnt out).
4) Look at the opening, you will see 3 flat chrome colored contacts on the assembly.
5) Notice the one by it self at the top of the opening, that is the "ground".
6) If you look closely you will notice the plastic around the ground contact has shrunk a little bit, this caused the contact to pull away from the socket, causing the problem.
7) With a small flat head screwdriver, VERY GENTLY pry up the contact so it stays slightly upward by itself.
8) Re-insert the bulb assembly back into the housing and press your brake petal with your lights on.
9) You should be in good to go!
10) Tools: Phillips head screwdriver and a small flat head screwdriver.
11) Time : 5 minutes per light
SOURCE: I have a 2006 Jeep Grand Cherokee Laredo. When I
I working on a car with the same problem I replaced the PCM (Powertrain Control Module) per Engineering to correct condition. It is covered under the federal emissions warenty for 8 years 80000 miles. Wierd problem just started seeing this to.
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