| Re: [GMCnet] Electrical Problem, Turning on Head Lights blows 3 fuses - dash and exterior lights [message #90451] |
Mon, 28 June 2010 18:44  |
J MASSEY
Messages: 4
Registered: June 2010
Karma: 0
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Thanks Steve,
The Step-by-Step procedure was not only an excellent guide , it was a
dead-on description of what I got.
replaced fuses
activate brakes and turn signals
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.
Thanks again to Steve Southworth, Jim Bounds, Ken Burton, Gene Fisher, and
Bob Price for their assistance.
John Massey
1977 Royale
Bowie, MD
Steve Southworth wrote on Sun, 27 Jun 2010 23:40:09 -0500
>OK - looking at a 77 diagram (thanks bdub) the common areas between the two
fuses are the front and rear park/turn/stop lights. The light switch has no
area common to both >circuits. Likewise the turn/hazard switch has no common
areas either. What is common is the wiring harness and the park/tail/turn/stop
lamp sockets and bulbs. Now if two wires >just shorted together there would be
more bulbs lighting up than expected for a specific function but it would be
unlikely that a fuse would operate. For the fuses to blow the >wiring/circuit
needs to be grounded.
>I further suspect that, although you are finding two blown fuses, they are not
blowing at the same time. What I would do next is to replace the fuses, step on
the brakes, run the >turn signals and then check the stop/hazard fuse. I
suspect it will be blown. Either way, then turn on the lights and check the
tail fuse.
>So test sequence would be:
>Replace fuses
>activate brakes and/or turn signals
>check fuses
>replace any blown fuses
>turn on lights
>check fuses
>Then figure out where to go next.
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| Re: [GMCnet] Electrical Problem, Turning on Head Lights blows 3 fuses - dash and exterior lights [message #90480 is a reply to message #90451] |
Tue, 29 June 2010 20:43  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| J MASSEY wrote on Mon, 28 June 2010 18:44 |
Thanks Steve,
The Step-by-Step procedure was not only an excellent guide , it was a
dead-on description of what I got.
John Massey
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I'm glad to hear you are on track for this repair. I agree that KenB's check of the bulbs and sockets is next, then the trailer harness. Hopefully that will take care of it. If the problem turns out to be somewhere else let us know as there are places that have been problems before and there may even be some photos available. In any event we would like to hear what you find.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Electrical Problem, Turning on Head Lights blows 3 fuses - dash and exterior lights [message #90494 is a reply to message #90492] |
Wed, 30 June 2010 03:37 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Ken Burton wrote on Wed, 30 June 2010 02:29 |
Yes, that license plate light rusting up is one we often forget about.
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Yes that one can be easily forgotten. It is also a source of the feed wire to it being trapped and shorting out. In this case it should not be a factor as it has no connection to the brake/turn light circuit.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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