I'm hoping one of the electrical gurus can help me diagnose a recent problem.
My e-brake warning light has started randomly glowing when the e-brake is off. It doesn't illuminate full strength, however. When I set the e-brake the light gets brighter. When I release the brake, sometimes the light turns off like it should, other times it just dims to a faint glow.
I'm an electrical retard, so any advice is welcomed.
Matt- I've had the same issue on my Wagoneer for quite some time. Oddly, in my case it appears to be related to the drum shoe adjustment on the rear (I just haven't gotten around to pulling the drums/shoes and readjusting it) and/or the proportioning valve. Occassionally I'll slam on brakes, then feel a little "pop" and the light will go off, but only temporarily.
Can't wait to hear what you find out with yours. I'll certainly update what mine is when I get the chance to tear into it.
Edit: I'm at work so I didn't read your symptoms as carefully as I should have the first time. Mine is only a "slightly" fainter glow, and is less erratic, so yours certainly does sound more like an electrical issue.
The chang in brightness is interesting. If it was the ebrake or the combination valve as in pmans case it should glow brightly
But a glowing or a dim light sounds more like a pinched wire or something. The light has power going to it all the time, when one of the switches makes contact with ground it glows brightly.
It also goes to the ignition switch so that it turns on when starting the jeep. or it should.
When a bulb is dim it's usually a sign of something in series with the bulb splitting the voltage between the bulb and something else. Usually another bulb will have the right reesistance to split the voltage evenly to dim the bulb.
So what does that leave us with?
A poor ground in the harness.
Somewhat conductive grease/dirt in the switches.
A poor short to ground. (The worst type.)
I would disconnect the e-brake connection and see if the problem goes away. Then reconnect it and see if it comes back. If it does, clean the switch with tuner leaner.
If it still doing it, I would check to see if the wires going to the Combination valve is melted against the exhaust pipe. Great place for a poor ground.
Its funny you saying jiggling the wires is not a technical way to resolve an issue. My 2004 Honda FSM says to do that for issues with the SRS light and only trace possible wiring problems if it occurs more than 2 times. Had mine in 2x under warranty and wouldn't you know it came on less than 1k miles after the warranty expired again. Ohh well I've driven it 70k more miles now and don't even notice the light anymore.
i had an e brake light issue with mine but it stayed on bright when the brake was off. The plunger was bent and would rotate every once in a while and miss the brake lever. I think I finally got it straightened out enough to where it won't miss the brake lever again.