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[GMCnet] short [message #337648]

Sat, 06 October 2018 11:40

jhsilva19

Messages: 35
Registered: March 2006

Karma: 0

Member

Gentlemen..
I have tried everything..a 20 amp fuse keeps blowing and I've run out of
options. My clearance lights refuse to work ..Any ideas ?
73 sequoia

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Re: [GMCnet] short [message #337650 is a reply to message #337648]

Sat, 06 October 2018 12:03

Sammy Williams

Messages: 522
Registered: August 2010

Karma: -2

Senior Member

Check your grounds and ensure wires are not touching causing shorts. Check
sockets too. You have circuits shorting somewhere.

On Sat, Oct 6, 2018, 11:35 jhsilva19@verizon.net
wrote:

> Gentlemen..
> I have tried everything..a 20 amp fuse keeps blowing and I've run out of
> options. My clearance lights refuse to work ..Any ideas ?
> 73 sequoia
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: [GMCnet] short [message #337651 is a reply to message #337648]

Sat, 06 October 2018 12:26

JerryW

Messages: 256
Registered: August 2018

Karma: 1

Senior Member

Have you done anything with your rail awning lately?
The rear top lights have usually been wired backwards by the factory. They have the hot lead going to the shell of the lights and the ground wire going to the bulb. Since the shell is screwed down to the fiberglass panel it didn’t cause any problems but if someone has put on an awning rail that touches the passenger side shell of the clearance light it is putting a direct short from the hot lead to the ground. It is necessary to move the clearance light a little to give clearance and if you have the inner panel off the wires to the lights should be reversed to have the hot lead going to the bulb.

If that is not your problem let us know and we may have other suggestions.

There is a ground connection for the lights near the license plate on the inside. That often gets corroded and stops the lights from getting a proper ground. Clean it up and put on some dielectric grease and use a star washer to insure a good connection.

Emery Stora
77 Kingsley
Frederick, CO

> On Oct 6, 2018, at 10:34 AM, jhsilva19@verizon.net wrote:
>
> Gentlemen..
> I have tried everything..a 20 amp fuse keeps blowing and I've run out of
> options. My clearance lights refuse to work ..Any ideas ?
> 73 sequoia
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Re: [GMCnet] short [message #337655 is a reply to message #337648]

Sat, 06 October 2018 17:17

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

I have done a lot of diagnosis of electric stuff. I will suggest that you solder a pair of wires to a blown fuse solder and the other end of that pair to a small lightbulb. When you put that fuse in, the bulb will light. Now, keep doing things until that bulb goes dim.
What to do?
Just keep opening things up until you get that light to change.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] short [message #337657 is a reply to message #337651]

Sat, 06 October 2018 17:40

jhsilva19

Messages: 35
Registered: March 2006

Karma: 0

Member

Thanks Emery.. I hadn't done anything with the rail, but the info you gave
about the
Wiring hit a home run... Rechecking, found one of the top lights shorted.
(with the bulb removed)

People should be aware that there is a distinct possibility of a shorted
socket.

Thanks again..

Jose'

To: gmclist@list.gmcnet.org
Cc: Emery Stora
Subject: Re: [GMCnet] short

Have you done anything with your rail awning lately?
The rear top lights have usually been wired backwards by the factory. They
have the hot lead going to the shell of the lights and the ground wire going
to the bulb. Since the shell is screwed down to the fiberglass panel it
didnï¿½t cause any problems but if someone has put on an awning rail that
touches the passenger side shell of the clearance light it is putting a
direct short from the hot lead to the ground. It is necessary to move the
clearance light a little to give clearance and if you have the inner panel
off the wires to the lights should be reversed to have the hot lead going to
the bulb.

If that is not your problem let us know and we may have other suggestions.

There is a ground connection for the lights near the license plate on the
inside. That often gets corroded and stops the lights from getting a proper
ground. Clean it up and put on some dielectric grease and use a star washer
to insure a good connection.

Emery Stora
77 Kingsley
Frederick, CO

> On Oct 6, 2018, at 10:34 AM, jhsilva19@verizon.net wrote:
>
> Gentlemen..
> I have tried everything..a 20 amp fuse keeps blowing and I've run out of
> options. My clearance lights refuse to work ..Any ideas ?
> 73 sequoia
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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