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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Jul-02-2018, 02:40:36 PM   #1
tripitz
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Default Fixing Tail Light Problem

My driver's side passenger light does not go on. I have confirmed that it is not the housing as I ran 12v through the connectors and the light comes on.

While I still need to confirm that it is not a fuse, I did cut out quite a bit of wiring out of the car as it is a track car and I may have cut this particular wire. When thinking about a quick fix, can I splice into the passenger side wiring for the right side tail that does work and just piggy-back off of that? Will that cause the wiring to overheat/melt if I draw current for 2 bulbs off of it?

I have all of my wires in a loom with significant safety gear in the way and want to avoid removing as much as possible in the short term (until I remove it all when the cage goes in). I can go for a more permanent fix in the off season. Right now I have an upcoming night event and I need my tail lights to work (brake lights are 100% okay).
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Old Mon, Jul-02-2018, 09:25:54 PM   #2
NolliM3
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Default Re: Fixing Tail Light Problem

I wouldn't do the piggy-back...our cars are very sensitive to electrical changes.
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Old Tue, Jul-03-2018, 12:54:49 AM   #3
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Default Re: Fixing Tail Light Problem

Do you have the Bentley manual? You can trace the wire underneath the carpet of the dead pedal foot rest that runs along the driver side to the tail light. Not sure if you cut out wiring from the fuse box/relay area as well as that might be tricky to navigate.

This was my experience running wires for the euro rear fog light switch to the tail lights.
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Old Tue, Jul-03-2018, 01:32:57 AM   #4
tripitz
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Default Re: Fixing Tail Light Problem

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Originally Posted by tofunin View Post
Do you have the Bentley manual? You can trace the wire underneath the carpet of the dead pedal foot rest that runs along the driver side to the tail light. Not sure if you cut out wiring from the fuse box/relay area as well as that might be tricky to navigate.

This was my experience running wires for the euro rear fog light switch to the tail lights.
I do have the manual. Problem is that it is all in sheathing and tucked away under a bunch of annoying to install/remove safety gear. I'm going to do that at end of season.

I may just run a single power wire from a switched/fused panel to the rear for this one event...
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Old Tue, Jul-03-2018, 01:59:38 AM   #5
tofunin
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Default Re: Fixing Tail Light Problem

I did piggy back the fog light pin from driver to the passenger side so you might be ok. iirc I used 14 gauge wire.
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Old Sat, Jul-07-2018, 02:35:28 AM   #6
Double E
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Default Re: Fixing Tail Light Problem

Our track car is hacked to hell for electrics...you can do what you are thinking and feed all three (center, left, right) off of one brake light or regular circuit. Because our cool box is back there too, we run the wiring across the trunk to keep the wiring out of the way of a quick ice change. Use an LED bulb for less power draw and better reliability too.

Concerning sensitivity, we did have an odd occurrence long ago during a race when the hazard lights suddenly came on, with no way to turn them off. That switch mechanism had been removed long ago and there they were, years later blinking for no known reason. We pulled the directional signal bulbs.
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Old Mon, Jul-09-2018, 01:25:43 AM   #7
tripitz
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Default Re: Fixing Tail Light Problem

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Originally Posted by Double E View Post
Our track car is hacked to hell for electrics...you can do what you are thinking and feed all three (center, left, right) off of one brake light or regular circuit. Because our cool box is back there too, we run the wiring across the trunk to keep the wiring out of the way of a quick ice change. Use an LED bulb for less power draw and better reliability too.

Concerning sensitivity, we did have an odd occurrence long ago during a race when the hazard lights suddenly came on, with no way to turn them off. That switch mechanism had been removed long ago and there they were, years later blinking for no known reason. We pulled the directional signal bulbs.
Thanks for the note! I actually tracked down the problem and it is currently working. Now I just need an LED strip so I can see my dash

About the hazards, they came on randomly when my buddy got all out of sorts with the car! Kind of funny...
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Discussing Fixing Tail Light Problem in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)