| [GMCnet] Turn signals stopped working [message #250896] |
Thu, 29 May 2014 08:16  |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
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Junior Member |
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Hi there,
Finally took the GMC out for its first real outing last weekend. For the
most part, everything worked out great but for some reason, the turn
signals stopped working. They were working fine Friday night, then Saturday
morning, nothing. The bulbs all look good as does the fuse. I also noticed
that when I press the brakes, the front running lights and both directional
indicators on the dash come on now.
Anyone know what might be happening?
Thanks
Steve Thomas
78 Eleganza
Santa Cruz
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| Re: [GMCnet] Turn signals stopped working [message #250897 is a reply to message #250896] |
Thu, 29 May 2014 10:27  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Stephen Thomas wrote on Thu, 29 May 2014 06:16Hi there,
Finally took the GMC out for its first real outing last weekend. For the
most part, everything worked out great but for some reason, the turn
signals stopped working. They were working fine Friday night, then Saturday
morning, nothing. The bulbs all look good as does the fuse. I also noticed
that when I press the brakes, the front running lights and both directional
indicators on the dash come on now.
Anyone know what might be happening?
Thanks
Steve Thomas
78 Eleganza
Santa Cruz
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Sounds like a grounding issue to me. Check the grounds on parking light/turn signals to start with.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Turn signals stopped working [message #250898 is a reply to message #250896] |
Thu, 29 May 2014 08:30 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Bad grounds. Reverse feeding. Common GM problem when the dash lights come
on when you apply brake. Check the wire harness at the bottom of the
steering column near the brake light switch. Also wiring in and around the
area of the turn signal flasher. Many more places as well.
Jim Hupy
SALEM, Or (currently at Hill City, S.D., near Mt. Rushmore)
78 Gmc Royale 403
On May 29, 2014 7:16 AM, "Stephen Thomas" wrote:
> Hi there,
>
> Finally took the GMC out for its first real outing last weekend. For the
> most part, everything worked out great but for some reason, the turn
> signals stopped working. They were working fine Friday night, then Saturday
> morning, nothing. The bulbs all look good as does the fuse. I also noticed
> that when I press the brakes, the front running lights and both directional
> indicators on the dash come on now.
>
> Anyone know what might be happening?
>
> Thanks
> Steve Thomas
> 78 Eleganza
> Santa Cruz
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Turn signals stopped working [message #250899 is a reply to message #250896] |
Thu, 29 May 2014 10:47 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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You have lost the ground circuit for the brake lights and taillights at the rear of the coach. I would start back there. Jumper the ground wire back there and see if that makes things work correctly. If it only works on the side you ground, the problem is on the other side or between the two lights in the harness, probably where trailer hitch wiring was added to the system.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
[Updated on: Thu, 29 May 2014 11:02] Report message to a moderator |
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| Re: [GMCnet] Turn signals stopped working [message #250919 is a reply to message #250899] |
Thu, 29 May 2014 17:05 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Beside the things Jim and Carl suggested, you may have lost connection on one of the ground jumpers between the body and the frame or the engine and the frame. The headlights and brake lights are powered by the engine alternator and engine battery. The engine battery and alternator are grounded to the engine block and not the body. I believe tail and brake lights are grounded to the aluminum body of the coach. So to get a path from there the ground current must travel through both sets of jumpers that I mentioned. Do not go looking for these jumpers first. Just keep them in mind if you can not find the ground problem elsewhere.
The second item I would look at is the turn signal / 4 way flasher switches in the steering column. They are the same switch assembly. Try pushing and releasing the 4 way flasher switch a few times to see if that makes any difference.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Turn signals stopped working [message #251041 is a reply to message #251002] |
Fri, 30 May 2014 15:55 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Stephen Thomas wrote on Fri, 30 May 2014 08:41Awsome! Thanks for all the help.
I kinda figured it might be a common GM thing. I've seen older GMs running
lights come on when they brake and always wondered what was going on. I'm
sure glad it wasn't my horn!
I'll get into it tomorrow and check all the grounding. I've recently done a
lot of electrical work, so this makes sense.
Ken, what you're saying about the engine-body-frame grounding brings up
another question: If one of these grounding links is not connected
properly, could it affect engine performance? I'm also having an issue with
a hesitation while accelerating and going up hills.
Steve
The simple answer is NO. But that assumes that your coach is wired as it left the factory and no one has changed things over the years.
The master ground for all things powered by the engine driven alternator is the ENGINE BLOCK. This means that all engine powered accessories (including the engine battery) should be getting their ground circuit from the engine block and not the steel frame or the aluminum body. This means the cross over straps to the frame and body are not in the circuit at all.
There are two exceptions to the above. GM wired the tail and brake lights to the body. This was probably because they were supplied with the body and the body engineers did not think about it at the time. Also the cruise control is wired to the body. I have "fixed" several cruise controls by moving the cruise control ground wire to the engine block.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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