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Old 07-21-2008, 09:49 AM   #1
S1MPSONS
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Default Tail Light Fuse Keeps Blowing. Help Please.

Hey Guys,

My rear tail light fuse keeps blowing and I don't know why. I change it to a new 10amp fuse every couple of weeks and sure enough it dies.

Is there a safe and reasonable fix for this? Perhaps running a different fuse amperage. Are there any other lights or electronics connected to the circuit I could investigate?

Any help would be greatly appreciated.
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Old 07-21-2008, 12:02 PM   #2
wrxskier18
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Have you ever messed with the tail light before for wiring harnesses or the "JDM" mod?

could be a bad ground or something. Try taking the lamp off and checking connections. Do you know how to use a multimeter?
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Old 07-21-2008, 12:30 PM   #3
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Quote:
Originally Posted by wrxskier18 View Post
Have you ever messed with the tail light before for wiring harnesses or the "JDM" mod?

could be a bad ground or something. Try taking the lamp off and checking connections. Do you know how to use a multimeter?
I have a cheap multimeter (or volt meter no sure) that I don't really know how to use. What do I do

I know I have a loose ground under the i/c that is supposed to be grounded to the top of the trans housing. I'll fix that and see if that works.
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Old 07-21-2008, 12:50 PM   #4
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do NOT replace it w/ a higher rated fuse.
that fuse may be all that is keeping wiring from burning if you are getting an intermittant dead short.
possibly due to worn insulation, bare or loose wire, etc.

EDIT- (add)
you may do better if this thread gets moved to lighting & electrical.
the gurus there may be able to help you isolate what is on that circuit.

Last edited by ekw; 07-21-2008 at 12:51 PM. Reason: more info
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Old 07-21-2008, 02:27 PM   #5
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Might want to check and see if there is any condensation in the lamp that is creating the short....
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Old 07-21-2008, 07:50 PM   #6
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I recently found on another vehicle, that someone had modified the rear lights.. and the wires themselves were rubbing through/ shorting out on the frame/ body mounts, and blowing the fuses.. Start at the end of the circuit and work your way up..
It might take a while.. but go slowly, and you'll find the problem...



Patience is a virtue... for everything else... there's beer.....
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Old 07-22-2008, 01:15 AM   #7
S1MPSONS
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Quote:
Originally Posted by 105wrx View Post
Might want to check and see if there is any condensation in the lamp that is creating the short....
There more than likely is moisture in the housing. Is this really a possible cause?
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Old 07-22-2008, 01:59 AM   #8
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Anyone else have any suggestions or can direct me to a how-to-use a multimeter page?
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Old 07-22-2008, 12:04 PM   #9
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Old 07-23-2008, 09:10 AM   #10
S1MPSONS
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Quote:
Originally Posted by wrxskier18 View Post
Yay! Okay so how do I apply that to my rear tail light circuit? Right now, being that I just changed the fuse, everything is in working order. How will I be able to catch the problem with a multimeter? What should I be measuring? Where on the circuit should I be measuring?
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