Interior light trouble shooting - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

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post #1 of 19 (permalink) Old Sep 26th, 09, 04:43 PM Thread Starter
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Interior light trouble shooting

This morning I drove the car all seemed fine. Tonight I start up to leave and no interior lights. The clock, courtesy and dome lights & cigarette lighter seem to be on the same circuit. I unplugged the clock and cigarette lighter and I am still popping fuses. This is a quick burn so it must be a short.

Where to start checking?

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post #2 of 19 (permalink) Old Sep 26th, 09, 06:08 PM
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Re: Interior light trouble shooting

You have the wiring diagrams? The problem is that if you pulled the fuse, the hot side will probably show continuity to ground. The question is where is the short? Best advise would be to check out the individual receptacles and hopefully the issue is in the light sockets. If not, you gotta start tracing.

If you have a console, it could be there as well. With a little luck, that's where it will be, chafed wire under the console. You can check that by unplugging the console multi connector.

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post #3 of 19 (permalink) Old Sep 26th, 09, 06:19 PM Thread Starter
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Re: Interior light trouble shooting

So I have pulled all bulbs, disconnected all wiring that I know of. The load side of the fuse block would show 0 OHMS to ground if there is a short in the wiring. If not then put 1 bulb or connector at a time and check load side of fuse to ground?

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post #4 of 19 (permalink) Old Sep 26th, 09, 06:22 PM
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Re: Interior light trouble shooting

I would guess the cigarette lighter is bad. Fairly common. If you check with a multi-meter, ANY ohms would be a short or high resistance, which in a short fuse would pop.

Has there been any maintenance done to the car lately?

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post #5 of 19 (permalink) Old Sep 26th, 09, 06:37 PM
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Re: Interior light trouble shooting

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Originally Posted by wiskeesour View Post
I would guess the cigarette lighter is bad. Fairly common. If you check with a multi-meter, ANY ohms would be a short or high resistance, which in a short fuse would pop.

Has there been any maintenance done to the car lately?

He said he disconnected the lighter. Gary, you do mean you pulled the wire off the back, right?
The sockets themselves often get screwed up and short out, especially if you use a phone charger or gps in it that doesn't fit really well, or needs some wigglin to get it to work.

Console car or not Gary?

Clock?

To find this, you need to disconnect all the loads (courtesy light bulbs, including console, clock, and lighter) and then measure ohms from the load side of the blown fuse to ground. Should read infinity. If not, chase the orange wire until you find the short.





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post #6 of 19 (permalink) Old Sep 26th, 09, 06:57 PM Thread Starter
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Re: Interior light trouble shooting

No maintenance lately. I used a phone charger this morning. I have used it before. So possibly the socket got messed up this time?

Yes I pulled the connector off of the lighter socket and it is a console with clock car. The gauge lights are thru the headlight circuit.

It turns out that the last bulb I pulled, the rear courtesy light in the console, is the problem. Infinity OHMS with all bulbs and sockets off and 0 OHMS with the rear courtesy light bulb in. So I can say it is the bulb or it is still in the orange wire somewhere?

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post #7 of 19 (permalink) Old Sep 26th, 09, 07:04 PM
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Re: Interior light trouble shooting

A light bulb measure very low resistance. Put your meter back on with that bulb in, and close the door (bet you're working with the door open?)
If the meter goes to inifinity with the doors closed, you've reached "NORMAL"

Put the fuse back in, did it blow?
Put the connector back on the lighter, did that blow the fuse?





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post #8 of 19 (permalink) Old Sep 26th, 09, 07:07 PM
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Re: Interior light trouble shooting

I was agreeing with him Jim.

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post #9 of 19 (permalink) Old Sep 26th, 09, 07:25 PM Thread Starter
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Re: Interior light trouble shooting

Rear light bulb in. Ohmmeter connected to fuse block and ground while holding door switch closed. The fuse does not burn. Now I will try 1 bulb/connector at a time. The one that burns the fuse will be the leg that is bad?

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Last edited by Gary L; Sep 26th, 09 at 08:56 PM.
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post #10 of 19 (permalink) Old Sep 26th, 09, 07:35 PM Thread Starter
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Re: Interior light trouble shooting

All light bulbs and the lighter are working. Only the clock is disconnected. I may need to pull the seat out tomorrow to contort so I can plug the clock back in. Can the clock really blow a 20A fuse? Would the points have to weld together?

"Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master." ..... George Washington

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Last edited by Gary L; Sep 26th, 09 at 08:57 PM.
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post #11 of 19 (permalink) Old Sep 26th, 09, 09:14 PM
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Re: Interior light trouble shooting

Well, if the clock is shorted, yes, it will pop the fuse. If you can, one end of the multimeter to ground, the other end to the hot side of the clock with power lead disconnected. If you get 0 ohms, the clock is shorted to ground and that will pop the fuse.

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post #12 of 19 (permalink) Old Sep 27th, 09, 10:07 AM Thread Starter
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Re: Interior light trouble shooting

Thanks guys.

The darndest thing. Everything is back together and working. I have no clue what I did, if anything, to fix it. Maybe a wire was pinched?

"Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master." ..... George Washington

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post #13 of 19 (permalink) Old Sep 27th, 09, 10:18 AM
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Re: Interior light trouble shooting

Gary,

I once had a short traced down to the RH front parking light. It ended up being the interior of the bulb socket that was pushed off center and touching the side. Once I removed and carefully re-inserted the bulb my short went away. Maybe your problem was similar.

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post #14 of 19 (permalink) Old Sep 27th, 09, 10:58 AM Thread Starter
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Re: Interior light trouble shooting

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Gary,

I once had a short traced down to the RH front parking light. It ended up being the interior of the bulb socket that was pushed off center and touching the side. Once I removed and carefully re-inserted the bulb my short went away. Maybe your problem was similar.

I'm thinking something along that line.

"Government is not reason; it is not eloquent; it is force. Like fire, it is a dangerous servant and a fearful master." ..... George Washington

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post #15 of 19 (permalink) Old Mar 19th, 10, 08:36 AM
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Re: Interior light trouble shooting

I'm having the same problem now as you did Gary. Everything is disconnected (that I know of) Dome light, rear console light, no glove box light and no under dash light bulbs. Pulled clocked, pulled headlight switch, went through 8 fuses already.
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