Home » Public Forums » GMCnet » [GMCnet] Electrical Problem, Turning on Head Lights blows fuse
| [GMCnet] Electrical Problem, Turning on Head Lights blows fuse [message #91065] |
Sun, 04 July 2010 14:34  |
J MASSEY
Messages: 4
Registered: June 2010
Karma: 0
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Junior Member |
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These are the steps taken so far...
The Tail lights are clean.
Removed covers on all 10 clearance lights. Found 3 with disintegrated
connectors with just wires held up by a spring and 2 with some light
corrosion. Cleaned everything up, lights still grounded.
Checked license plate light, side lights (front and back ) and front lights
all ok.
Inspected trailer cable and connector. Blue Qx connector had broken wire but
otherwise OK
No crimped wire by frame.
Inside I removed dash left side upper and lower covers.
Went over the upper section cable bundles, wiring and connectors with
light and mirror looking for any evidence of heat damage. - nothing
lower section found fused connectors on Turn Signal flasher. Clipped and
taped wires until I can get replacement.
No change to ground problem.
Hazard Flasher OK
Ref: GMC MH 77-78 Maint Man X7725, 12-5, Figure 10 Instrument Panel ....
Control Harness
If I can get to and disconnect the Front Roof harness connector and the Rear
and ID Light connector that should isolate the problem. These look to be in
the driveršs side panel? Are they accessible?
John
John Massey wrote on Monday, June 28, 2010 7:44 PM
> .... what I got.
>replaced fuses
>activate brakes
>check fuses
> Blew the Hazard Warning Light, Stop Light (SFE-20) fuse
>replace the blown fuse
?turn on headlights to Park (didnšt touch brakes or turn signals)
> Blew the Side marker, ID & Clearance Lights, Tail Lights, Dome Lights, License
Lights (SFE20) fuse only
>As soon as it stops raining, Išll start removing bulbs, inspecting and
cleaning sockets as Ken Burton suggested. Išll make some other checks other
members recommended such as >the trailer connection while Išm at it. At least
now that the storm front has come thru, the weather will be cooler.>
>snip
>
>John Massey
>1977 Royale
>Bowie, MD
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| Re: [GMCnet] Electrical Problem, Turning on Head Lights blows fuse [message #91069 is a reply to message #91065] |
Sun, 04 July 2010 14:55  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| J MASSEY wrote on Sun, 04 July 2010 14:34 |
These are the steps taken so far...
The Tail lights are clean.
Removed covers on all 10 clearance lights. Found 3 with disintegrated
connectors with just wires held up by a spring and 2 with some light
corrosion. Cleaned everything up, lights still grounded.
Checked license plate light, side lights (front and back ) and front lights
all ok.
Inspected trailer cable and connector. Blue Qx connector had broken wire but
otherwise OK
No crimped wire by frame.
Inside I removed dash left side upper and lower covers.
Went over the upper section cable bundles, wiring and connectors with
light and mirror looking for any evidence of heat damage. - nothing
lower section found fused connectors on Turn Signal flasher. Clipped and
taped wires until I can get replacement.
No change to ground problem.
Hazard Flasher OK
Ref: GMC MH 77-78 Maint Man X7725, 12-5, Figure 10 Instrument Panel ....
Control Harness
If I can get to and disconnect the Front Roof harness connector and the Rear
and ID Light connector that should isolate the problem. These look to be in
the driveršs side panel? Are they accessible?
John
John Massey wrote on Monday, June 28, 2010 7:44 PM
> .... what I got.
>replaced fuses
>activate brakes
>check fuses
> Blew the Hazard Warning Light, Stop Light (SFE-20) fuse
>replace the blown fuse
?turn on headlights to Park (didnšt touch brakes or turn signals)
> Blew the Side marker, ID & Clearance Lights, Tail Lights, Dome Lights, License
Lights (SFE20) fuse only
>As soon as it stops raining, Išll start removing bulbs, inspecting and
cleaning sockets as Ken Burton suggested. Išll make some other checks other
members recommended such as >the trailer connection while Išm at it. At least
now that the storm front has come thru, the weather will be cooler.>
>snip
>
>John Massey
>1977 Royale
>Bowie, MD
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Well you went through all of my quick guesses. Now I guess you just have to go find the short. You might want to remove the headlight switch from the dash panel so it is not grounded to the panel and try again. Your overhead (dome) lights will not work without it grounded but who cares.
Good luck.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Electrical Problem, Turning on Head Lights blows fuse [message #91071 is a reply to message #91065] |
Sun, 04 July 2010 15:03 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
The only time I've seen those two connectors is when I've had the driver's
side panel removed. I won't say you CAN'T get to them otherwise, but I
doubt that you can and wouldn't even try.
Because of the fact that the first lower wall panel gehind the cockpit fits
into a groove on the vertical rear of the driver's side panel, removal a
real bear. Especially since the hidden flange of that groove is wider than
the exposed one.
Faced with removing the driver's panel alone, I'd be sorely tempted to
resort to Gene's GMC tool (my "Magic Tool", HF's Multitool). Cutting
diagonally from the exposed edge of the groove toward the forward outside,
one could cut the edge of the wall panel and the inner flange, releasing the
driver's panel without leaving much exposed damage. Even if a piece of trim
of some sort was then required to cover the damage, it would beat removing
furniture and the wall panel. I THINK.
JWID,
Ken H.
On Sun, Jul 4, 2010 at 3:34 PM, J MASSEY <johnmmassey@verizon.net> wrote:
> ...If I can get to and disconnect the Front Roof harness connector and the
> Rear
> and ID Light connector that should isolate the problem. These look to be in
> the driveršs side panel? Are they accessible?
>
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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