My lights are possessed - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-07-2003, 09:50 AM   #1
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Default My lights are possessed

I noticed my dash lights were a little dim this morning. When I hit my brakes then brighten up. Also, when the car is off and I hit my brakes my dash lights and parking lights come on. This sounds like a wiring issue.


Only thing I can think of is that I've been messing with my tail lights lately. I've had to go through the wiring because I was blowing fuses and grounding out.

I'm not too sure what this is, but I might not mind the gauges coming on before the car starts??? It'* kind of like my sisters regal that the gauges go on when the door opens??
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Old 04-07-2003, 03:43 PM   #2
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Default Re: My lights are possessed

Quote:
Originally Posted by zzzzzeke
I noticed my dash lights were a little dim this morning. When I hit my brakes then brighten up. Also, when the car is off and I hit my brakes my dash lights and parking lights come on. This sounds like a wiring issue.

Only thing I can think of is that I've been messing with my tail lights lately. I've had to go through the wiring because I was blowing fuses and grounding out.

I'm not too sure what this is, but I might not mind the gauges coming on before the car starts??? It'* kind of like my sisters regal that the gauges go on when the door opens??
Why, are you fixing your sister'* car as well?

Okay, I'm almost positive you have a bad ground in your taillights. When you step on the brake, current flows down the wire to the brake lamps, can't get to ground, and doubles back through the taillamp/parking-lamp circuit, which shares the same ground connections. Current comes back up the taillamp wires and circulates through everything connected to them, including your dashboard lighting, and there you are.

1) So, first have an assistant get in the car, turn on the taillamps, then step on the brake. Any light that goes out when it'* supposed to get brighter is your culprit: it'* getting voltage on both tail and brake circuits, but has no ground. When _one_ of its circuits is hot, it can use the other as a ground path and light the bulb. When _both_ of its circuits are hot, current has nowhere to go (since the ground path is broken), and the bulb goes out.

2) Remove the offending bulb and swap it with another brake lamp that'* working properly, and re-test.

2a) If the symptoms move with the bulb, replace the bulb.

2b) If the symptoms stay with the problem socket, no matter what bulb you use, check its ground connection: it apparently doesn't have one.

Have fun...
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Old 04-07-2003, 04:56 PM   #3
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no i think my sister'* regal is supposed to do that??? they are on a timer after the door shuts. thanks for the info on my car. i was pretty sure it was in the tails cuz i've kinda been messing with them
thanks
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Old 04-07-2003, 05:03 PM   #4
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Quote:
Originally Posted by zzzzzeke
no i think my sister'* regal is supposed to do that??? they are on a timer after the door shuts.
Oh, you mean lights inside the car that stay on after the door closes? Yes, there are some options that do that. On the SSEi you have 20 seconds after the driver'* door closes before the interior lights click off. On our '96 Trans Sport it'* similar, except that instead of clicking off abruptly, they do a theatrical fade instead. MoPar K cars have had a little spotlight in their steering columns for years that would light up the ignition switch for you after you got in, and that sort of thing.

Quote:
Originally Posted by zzzzzeke
thanks for the info on my car. i was pretty sure it was in the tails cuz i've kinda been messing with them
thanks
Ayup, you should have this sorted out pretty quick.
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Old 04-07-2003, 08:35 PM   #5
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god am i stupid....whoops accidently put a 1156 in for a 2057
to sum things up i am a dumbass and shouldn't be allowed vehicles! j/k
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Old 04-08-2003, 01:54 PM   #6
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Originally Posted by zzzzzeke
god am i stupid....whoops accidently put a 1156 in for a 2057
to sum things up i am a dumbass and shouldn't be allowed vehicles! j/k
Well, if you fix your sister'* car, try not to set fire to it...

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Old 04-08-2003, 04:09 PM   #7
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i think its fine....i think it'* an option???!! when the door opens the cluster comes on, and when u shut the door, it'* on a timer.....doesn't seem to be a problem
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Old 04-08-2003, 04:34 PM   #8
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Originally Posted by zzzzzeke
i think its fine....i think it'* an option???!! when the door opens the cluster comes on, and when u shut the door, it'* on a timer.....doesn't seem to be a problem
Right; I just mean that if or when you decide that something _is_ broken on your sister'* car, and decide to fix it, just promise us that you won't make it worse... (Hey, you're the one who said he shouldn't be allowed around cars! )
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