| Headlights or the lack thereof [message #174247] |
Thu, 21 June 2012 22:38  |
Ernest Dankert
Messages: 133
Registered: May 2007
Location: Ogden, New York
Karma: 1
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Senior Member |
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Any words of wisdom on why both headlights won't light up? I have marker and parking lights.
My plan is to check for power at the light socket tomorrow, in which case I may have lost the ground circuit.
1977 Eleganza II
Ogden NY
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| Re: [GMCnet] Headlights or the lack thereof [message #174251 is a reply to message #174247] |
Thu, 21 June 2012 22:44  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Headlights are fed from the dimmer switch on the floor by your left foot.
Power comes from the headlamp switch to the dimmer switch, and it is
switched from low beam to high beam by the switch. from there, the wiring
goes to the headlamp female sockets. Check the dimmer switch for power when
the headlights are turned on, then go to the headlamps themselves, and from
there to the ground point on the firewall. That is the circuit for the
headlights.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Thu, Jun 21, 2012 at 8:38 PM, Ernest Dankert
<edankert@rochester.rr.com>wrote:
>
>
> Any words of wisdom on why both headlights won't light up? I have marker
> and parking lights.
>
> My plan is to check for power at the light socket tomorrow, in which case
> I may have lost the ground circuit.
> --
> 1977 Eleganza II
> Fairport NY
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| Re: Headlights or the lack thereof [message #174266 is a reply to message #174247] |
Fri, 22 June 2012 02:32 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| Ernest Dankert wrote on Thu, 21 June 2012 20:38 |
Any words of wisdom on why both headlights won't light up? I have marker and parking lights...
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Some headlight switches have internal self resetting circuit breakers built in. Does anyone know if the GMC oem switch is one of these?
Could be bad grounds.
Yep, time to dig out the volt meter.... It might be a good idea to look over the schematic.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Headlights success [message #174304 is a reply to message #174266] |
Fri, 22 June 2012 12:45 |
Ernest Dankert
Messages: 133
Registered: May 2007
Location: Ogden, New York
Karma: 1
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Senior Member |
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The GMC switch does have an internal CB. The problem turned out to be a bad hi resistance connection on the power relay/buzzer. The head light switch does have two power feeds, one for the headlights and the other for the marker/parking lights.
1977 Eleganza II
Ogden NY
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