Blowing fuse - tail lamps and dash lights don't work - SR20 Forum
 
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#1 (permalink) Old 05-05-2010, 11:17 PM
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Blowing fuse - tail lamps and dash lights don't work

I have a 1993. My 10amp "tail lamp" fuse keeps blowing causing my tail lights and dash light not to work. Brake lights still work. I know I have a short somewhere, I've torn apart the whole interior and trunk. I can't for the life of me find out where and its really starting to irritate me. I'm usually pretty good with electrically, but in this case I'm turning to you guys for more ideas.

Any suggestions? Any input is appreciated.
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#2 (permalink) Old 05-05-2010, 11:28 PM
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this just happen randomly? orrr were you working on the car and this happened?

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#3 (permalink) Old 05-05-2010, 11:59 PM
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Well a couple week ago I installed a wideband and a radar detector. Both installed correctly on their own fused circuits. They have been in there a while with no problems then all of a sudden this happened. I did have a burned out bulb in the wing. I replaced it and it works now, but there is still a short.
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#4 (permalink) Old 05-06-2010, 02:58 AM
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it could be a short in your cd player (assuming you have an aftermarket unit). most of the time its the orange illumination wire that people forget to tape up.

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#5 (permalink) Old 05-06-2010, 11:15 AM
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I have a stock radio and I pulled that out last night. Nothing changed.
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#6 (permalink) Old 05-07-2010, 07:29 PM
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The lightbulb you replaced is the wrong size/ampage or fitment, or the bulb is a double filliment bulb and you are using a single or the other way around.
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#7 (permalink) Old 05-07-2010, 08:44 PM
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Originally Posted by O-ROD View Post
The lightbulb you replaced is the wrong size/ampage or fitment, or the bulb is a double filliment bulb and you are using a single or the other way around.
I used a 921, which according to the owners manual is the right one... right?
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#8 (permalink) Old 05-08-2010, 11:36 PM
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i had the same thing happen to me it was my alt it was puting out to much power so check that
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#9 (permalink) Old 05-09-2010, 03:12 PM
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Originally Posted by dlynch View Post
i had the same thing happen to me it was my alt it was puting out to much power so check that
Alt is fine. Checked out good. The fuse will blow instantly whether the car is running or not.

All other circuits are fine, just the tail light and dash light circuit. I have literally the entire car tore apart and I've been probing everywhere. Tested the load and it is pulling some serious amps. I've run out of things to check.

Does anybody know where I can get wiring diagrams? The library has the service manual, but they are closed today.

Last edited by AndyVR4; 05-09-2010 at 03:13 PM.
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#10 (permalink) Old 05-09-2010, 05:03 PM
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a friend of mine got the same issue on a b13, the tailights and dashlights work only for about 2 or 3 days before blowing the fuse away. I checked almost everything but never got to check the size or type of the bulbs....

anybody got any other idea?
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#11 (permalink) Old 05-09-2010, 11:08 PM
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Well I'm thinking of selling this POS as is or maybe parting this fucking thing out. I took the entire dash out and unplugged pretty much everything. I disconnected the tail light circuit and the cluster. I was getting 12v at the fuse, but now nothing. I can't dick with this car for a another whole day.
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#12 (permalink) Old 05-10-2010, 12:24 AM
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idk then my alt was pushing out 14v

Last edited by dlynch; 05-10-2010 at 12:29 AM.
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#13 (permalink) Old 05-10-2010, 09:54 AM
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Remove that bulb you put in it. Then add the fuse, does the fuse blow then?

You must isolate that short, & determine if it is a short to ground or short to power. At least it is not the dreaded intermittent short.

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#14 (permalink) Old 05-10-2010, 12:32 PM
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Originally Posted by NeedMore$4SE-R View Post
Remove that bulb you put in it. Then add the fuse, does the fuse blow then?

You must isolate that short, & determine if it is a short to ground or short to power. At least it is not the dreaded intermittent short.
It blows with the whole tail light harness disconnected. I think I have isolated it to the harness under the dash. Pretty much everything is disconnected, so I'm thinking it may be in the harness bundle itself. I'm going to remove it tonight and check it over.

Also, all the yards around here have harnesses without tachs. How hard is it to add that or would I be better off just buying a harness from a car with a tach?
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#15 (permalink) Old 05-11-2010, 07:57 PM
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Quote:
Originally Posted by n2nismo View Post
it could be a short in your cd player (assuming you have an aftermarket unit). most of the time its the orange illumination wire that people forget to tape up.

im going to check this out because when ever i power shift to second the radio cuts out and rpm tach goes nuts...

and as far as the fuse problem..this was going on with my car to turned out the owner before me had the foglights wired to the parking lights and im guesing they were not grounded out good enough so my fuse would pop...so i just disconnected the foggers..check with anything wired to that fuse make sure your wideband and such is grounded out ....
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#16 (permalink) Old 05-12-2010, 09:06 PM
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found out what was causing my short...the negative battery post was touching the hood...so my car almost caught on fire earlier today fml good thing it was only ground wires if i cant get this back alive im parting out jdm sr20de with g20 tranny lsd how much could i get ?
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#17 (permalink) Old 05-17-2010, 01:41 PM
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its always something like that! dang. Is the battery taller than stock or something? that is really strange that happened. YOu can turn the black knobs on the cross member to raise the hood level and put a rubber top on the terminals. wow. crazyness. all that work and it was the battery!

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