Tail lights won't go off. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

2wdBlazer · 08-23-2004, 02:10 PM

I am not very elictrically inclined so I thought i'd ask here first. The tails and rear side markers are staying on. I swapped out the headlight switch because I had an extra but that did not help. I am assuming it is a ground or something but I have no idea where to start. Any suggestions?

Also, anyone know which fuse to pull so I can leave my battery hooked up? A pic would be nice.

Longhorn Man · 08-23-2004, 06:18 PM

Odd that it is just the tail lights and markers and not the front markers too. This shouldn't be a ground issue...pretty much not possible. (if there was a ground problem, they wouldn't work..and since electricity takes the path of least resistance and nothing is supposed to be on in that portion of the electrical system, that is not the path it would take)
I can help you on the fuse though...but honestly, I think unplugging the battery would be quicker/easier.

Blue Beard · 08-23-2004, 07:38 PM

Good pic of the fuse block, what did you use to overlay the print...?

MOTHERTRUCKERS · 08-23-2004, 07:50 PM

Unplug your steering column wires at the horseshoe and see if they go out, my guess is a turn signal switch problem but it's a guess.

Longhorn Man · 08-23-2004, 08:26 PM

Blue, I didn't do it, I pirated it from another member and have been pimpin it...I can picture his face,(and his girl friend's too) but I can't remember his screen name.
Mothertruckers...I was kinda thinking that, but is still doesn't make much sence since the side markers are on and that confirms that it is the parking lights and not the brakes...still a good quick troubleshooting step.

2wdBlazer · 08-24-2004, 08:53 AM

I will try that Ed. BTW I forgot to mention, the dash lights are on as well. I don't know if that means anything.

Fred T · 08-24-2004, 09:59 AM

I'm assuming you still have the original wiring in the truck. If so, it sounds like there are two wires that have rubbed together and are crossing circuits. Pita to troubleshoot, and makes a heck of a good case for a new harness.

What's getting me is that the front markers aren't lit, but the dash and tails are. Do the front markers work with the headlights on? I don't have any diagrams at work, but you need to look and see where the circuit for the wires run and what color they are. Then you get to start tracing at the headlight switch.

08-23-2004, 02:10 PM	#1
2wdBlazer The Blazer King Join Date: Sep 2000 Location: Valrico, Fl (Tampa) Posts: 1,213	Tail lights won't go off. I am not very elictrically inclined so I thought i'd ask here first. The tails and rear side markers are staying on. I swapped out the headlight switch because I had an extra but that did not help. I am assuming it is a ground or something but I have no idea where to start. Any suggestions? Also, anyone know which fuse to pull so I can leave my battery hooked up? A pic would be nice. __________________ 72 2wd Blazer. Its the superbichinest, megacoolinest, superflowinest.

08-23-2004, 06:18 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Odd that it is just the tail lights and markers and not the front markers too. This shouldn't be a ground issue...pretty much not possible. (if there was a ground problem, they wouldn't work..and since electricity takes the path of least resistance and nothing is supposed to be on in that portion of the electrical system, that is not the path it would take) I can help you on the fuse though...but honestly, I think unplugging the battery would be quicker/easier. Attached Images

08-23-2004, 07:38 PM	#3
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Good pic of the fuse block, what did you use to overlay the print...? __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

08-23-2004, 07:50 PM	#4
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	Unplug your steering column wires at the horseshoe and see if they go out, my guess is a turn signal switch problem but it's a guess. __________________ Rest in Peace Ed. Thanks for all the good times.

08-24-2004, 08:53 AM	#6
2wdBlazer The Blazer King Join Date: Sep 2000 Location: Valrico, Fl (Tampa) Posts: 1,213	I will try that Ed. BTW I forgot to mention, the dash lights are on as well. I don't know if that means anything. __________________ 72 2wd Blazer. Its the superbichinest, megacoolinest, superflowinest.

08-23-2004, 08:26 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Blue, I didn't do it, I pirated it from another member and have been pimpin it...I can picture his face,(and his girl friend's too) but I can't remember his screen name. Mothertruckers...I was kinda thinking that, but is still doesn't make much sence since the side markers are on and that confirms that it is the parking lights and not the brakes...still a good quick troubleshooting step.

08-24-2004, 09:59 AM	#7
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	I'm assuming you still have the original wiring in the truck. If so, it sounds like there are two wires that have rubbed together and are crossing circuits. Pita to troubleshoot, and makes a heck of a good case for a new harness. What's getting me is that the front markers aren't lit, but the dash and tails are. Do the front markers work with the headlights on? I don't have any diagrams at work, but you need to look and see where the circuit for the wires run and what color they are. Then you get to start tracing at the headlight switch. __________________ Fred There is no such thing as too much cam...just not enough engine.



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