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Topic: spare tire light ?

in Forum: C3 Electrical

spare tire light ?

Posted: 7/18/16 7:24pm Message 1 of 14
Former Member
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray
Hello All,

I have a 78 vette with a spare tire light that comes on for a few seconds once you open the door.

I had hooked up some under lighting to it and it looked sharp when it was working.

Took it to a shop for some brake work and the lift crushed the under lights, replaced them, however nothing is working now?

Not sure which fuse to check, and was also told about a relay behind the glove box as well?

Any ideas?

Thank you, in advance,





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Re: spare tire light ?

Posted: 7/22/16 4:11pm Message 2 of 14
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Germansville, PA - USA
Joined: 1/28/2010
Posts: 859
Vette(s): 1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.
Very likely crushed some of the wires and shorted out when you tried them blowing the fuse. I assume you hooked power to them from a light wire of some sort. Check the fuse for the lights first. If not take a 12 volt test light and check both sides of each fuse until you find one that doesn't light up the test light, that will more than likely be your problem. 


   

DanT

Re: spare tire light ?

Posted: 7/25/16 4:26pm Message 3 of 14
Former Member
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray

Just cant figure out which fuse this would be?

Looking at the image here for my fuse box:

http://s7.directupload.net/images/120125/xxn7fjgm.jpg

I changed out the clk ltr ctsy and it rest my radio.

all other items in car seem to be working?

Gages, tail lights etc, so looking at the diagram of the box did not help, and the box is so far
up, its hard to just look at the fuses one by one.



Re: spare tire light ?

Posted: 7/25/16 5:43pm Message 4 of 14
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Germansville, PA - USA
Joined: 1/28/2010
Posts: 859
Vette(s): 1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.
That's why you need a 12 volt test light.


   

DanT

Re: spare tire light ?

Posted: 7/25/16 5:47pm Message 5 of 14
Former Member
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray
Picked up a tested today, couldn't get anything to test / light up for me.


Re: spare tire light ?

Posted: 7/25/16 6:33pm Message 6 of 14
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray
buxton161 said: Picked up a tested today, couldn't get anything to test / light up for me.


touch both ends to each fuse and nothing lights up at all, ( car on ) however, it's a B*&^^ to get to as well.



Re: spare tire light ?

Posted: 7/25/16 7:00pm Message 7 of 14
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Germansville, PA - USA
Joined: 1/28/2010
Posts: 859
Vette(s): 1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.
Clip end of test light needs to clip on a good ground, a metal part under dash and other end you touch both ends of the fuse and check which fuse only lights on one end. If power is going thru fuse it will on both ends, if filament inside fuse is blown no power will come out the other side of fuse. It is most IMPORTANT that the clip end of test light is attached to a good ground!

|UPDATED|7/25/2016 7:00:33 PM (AZT)|/UPDATED|



   

DanT

Re: spare tire light ?

Posted: 7/25/16 7:03pm Message 8 of 14
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray
sorry to be suck an idiot here, so use the gator clip on any good metal, and the other to either end of the fuse?


Re: spare tire light ?

Posted: 7/25/16 7:08pm Message 9 of 14
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Germansville, PA - USA
Joined: 1/28/2010
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Vette(s): 1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.
buxton161 said: sorry to be suck an idiot here, so use the gator clip on any good metal, and the other to either end of the fuse?

Exactly! Your test light should light up on both sides of the fuse or it is blown. Corvettes can be tough to find good grounds on because of the fiber glass body.




   

DanT

Re: spare tire light ?

Posted: 7/28/16 6:00pm Message 10 of 14
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Scarborough, MA - USA
Joined: 5/30/2016
Posts: 30
Vette(s): 78 Corvette stingray


Thank you,

Well, they all work. I thought I found it as one did not test ok, but when I pulled it out my interior light on dash went out so I put it back.

I was told there is some sort of delay relay behind the glove box, could that be shorted out somehow?

Thank you.





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