Running lights went out??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC2 · 05-20-2002, 09:28 AM

I was bringing the new sled home Friday night,and my running lights (back and rear side markers) went out .I have checked the fuse and looked at the wiring to the lights,all looks ok.any ideas on whats wrong?

69 longhorn · 05-20-2002, 10:38 AM

Have you tested the fuse with an ohm meter? I have seen fuses that didnt look blown in the center,but didnt have continuity. Good luck.........69

71GMC_3/4T · 05-20-2002, 11:15 AM

If you still have dash lights, you probably still have a fuse for the running lights. If that's the case, look for a bad connection at the headlight switch.

GMC2 · 05-21-2002, 10:11 PM

I still have dash lights,and headlights,and front marker lights,just no rear running or side marker lights.

Longhorn Man · 05-21-2002, 10:14 PM

Sounds like a wire to me. Check where someone hacked in the trailer light plug. (you know it has it done like that) The Brown wire is the one you will wat to be looking at real close.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
E-mail longhornmail@yahoo.com
My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough?
Columbus Ohio

JVictor75 · 05-22-2002, 01:44 PM

Also a suggestion.

I went thru this yesterday. Look at the back of the connector for the bulb on your marker lights. There should be two wires. One is power and the other is ground. If you don't have a good ground connection, no lights.

Clean the point where the ground wire connects to the body or frame, if needed use a wire brush to clean it to the bare metal. If the connector isn't touching bare metal at least in one point at the connector due to paint dirt or rust they won't work.

Good Luck!

okietruck · 05-22-2002, 02:51 PM

Try using a voltmeter where the rear harness plugs in. If you have power, then the problem is farther back. If not, check the rear harness connector at the firewall. It is just a series of eliminations till you find the problem.

05-20-2002, 09:28 AM	#1
GMC2 Registered User Join Date: Jan 2002 Location: Gonzales,LA Posts: 46	Running lights went out??? I was bringing the new sled home Friday night,and my running lights (back and rear side markers) went out .I have checked the fuse and looked at the wiring to the lights,all looks ok.any ideas on whats wrong?

05-20-2002, 10:38 AM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Have you tested the fuse with an ohm meter? I have seen fuses that didnt look blown in the center,but didnt have continuity. Good luck.........69 __________________ http://community.webshots.com/user/hotrodhorn

05-20-2002, 11:15 AM	#3
71GMC_3/4T Weapons Of Construction Join Date: Apr 2000 Location: Colorado, USA Posts: 1,095	If you still have dash lights, you probably still have a fuse for the running lights. If that's the case, look for a bad connection at the headlight switch. __________________ 1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO

05-22-2002, 02:51 PM	#7
okietruck Registered User Join Date: Apr 2002 Location: Tulsa, OK, USA Posts: 117	Try using a voltmeter where the rear harness plugs in. If you have power, then the problem is farther back. If not, check the rear harness connector at the firewall. It is just a series of eliminations till you find the problem. __________________ '72 LWB Stepside

05-21-2002, 10:11 PM	#4
GMC2 Registered User Join Date: Jan 2002 Location: Gonzales,LA Posts: 46	I still have dash lights,and headlights,and front marker lights,just no rear running or side marker lights.

05-21-2002, 10:14 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Sounds like a wire to me. Check where someone hacked in the trailer light plug. (you know it has it done like that) The Brown wire is the one you will wat to be looking at real close. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. E-mail longhornmail@yahoo.com My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough? Columbus Ohio

05-22-2002, 01:44 PM	#6
JVictor75 Maintenance Man Join Date: May 2002 Location: Phoenix, AZ US Posts: 213	Also a suggestion. I went thru this yesterday. Look at the back of the connector for the bulb on your marker lights. There should be two wires. One is power and the other is ground. If you don't have a good ground connection, no lights. Clean the point where the ground wire connects to the body or frame, if needed use a wire brush to clean it to the bare metal. If the connector isn't touching bare metal at least in one point at the connector due to paint dirt or rust they won't work. Good Luck!



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