| [GMCnet] Light Wiring [message #269172] |
Wed, 07 January 2015 21:24  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Is it Politically Correct for a EE to hate wiring???
Today, with nothing else pressing to do, I decided to complete the
conversion of the road lighting to LED's. Only the parking lights and the
tag light were still incandescent. Nothing fancy going on: I just
replaced the parking lights with plug-in LED "bulbs". Stood outside and
reached thru the driver's window to try the turn signals; they worked
fine. Then check the parking lights -- they worked fine.
The tag light was a bigger job. I don't think it had ever been touched
since May 76 when the coach was built. I had to tear out one of the
captive nuts holding the assembly in place. Then use a metal cutting disc
to cut off that captive nut and the two nuts holding the parts of the
assembly together. Everything was covered with sprayed foam, and the lense
was mostly covered in paint primer and other stuff (I don't know if the tag
has been illuminated during my 15 year ownership). After about an hour of
metal bending, scraping, wire brushing, washing, gluing and generally
remodelling the light, it was ready to re-install, with a Gooped in place
LED bulb.
Standing outside again, I turned the parking lights on and walked to the
rear. Sure 'nuff, the tag was nicely illuminated, so I continued around
and into the cockpit. That's where the fun began: BOTH turn signal
indicators were illuminated! Huh???
With the parking/driving lights ON, the turn signals don't work and their
indicators stay on. With the p/d lights OFF, the turn signals work fine.
With the turn signal LEDs replaced with bulbs, the right indicator is off
but the left one is on and only the right turn signal works. Removing the
LED tag light has no effect. DVM from each illuminated parking light to
ground shows no voltage drop, so it's apparently not a ground problem. I'm
already too short on hair to be scratching my head like this!
PC or not, I hate light wiring!!!
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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