78 GL1000 No headlight


Information and questions on GL1000 Goldwings (1975-1979)
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ARCPrez
Posts: 4
Joined: Sun Apr 14, 2019 12:45 pm
Location: Regina,SK, Canada
Motorcycle: 1978 GL1000 - Daily rider
1979 GL1000 - parts donor
1984 GL1200 Aspencade -Project
1987 GL1200A Aspencade - setting up for touring

78 GL1000 No headlight

Post by ARCPrez »



I lost my low beam but still had high beam and now recently I have lost both.
I have power at the fuse.
I have power up to the dimmer switch.
Coming into the dimmer switch there is proper voltage going out I am around .26 on both white and blue wire.
I have the same voltage at the plug on the headlight.
Should I not have proper voltage coming out of that switch as well?
The high-beam indicator lamp does light but not consistently.

I may not understand how to read the wiring diagram what am I missing?
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dingdong
Posts: 4025
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: 78 GL1000 No headlight

Post by dingdong »

Check your starter switch. Remember, it turns the headlight out wnen pressed. It may be dirty and not making contact when released.
ARCPrez
Posts: 4
Joined: Sun Apr 14, 2019 12:45 pm
Location: Regina,SK, Canada
Motorcycle: 1978 GL1000 - Daily rider
1979 GL1000 - parts donor
1984 GL1200 Aspencade -Project
1987 GL1200A Aspencade - setting up for touring

Re: 78 GL1000 No headlight

Post by ARCPrez »

So I have pulled apart the starter switch sprayed it down with contact cleaner and tested voltage on the black wire and the black/red.
There is good voltage on both which I believe would indicate that the switch is allowing it to pass current.
Based on the original wiring diagram I posted it is black / red that sends the power to the fuse for the headlight. I have power at the fuse on both sides where are the black / yellow wire should take power up to the dimmer switch.
On the black / yellow wire at the switch I have proper voltage.
On both wires leaving the dimmer switch the white and the blue there is only .26 volts coming out.
Does the dimmer switch not pass current like a normal switch? Full power in and full power out?
fatalbert
Posts: 47
Joined: Sat Aug 12, 2017 11:11 am
Location: seattle,wash,usa
Motorcycle: 1975 honda goldwing(2), 1962 CA77, 1979 CBX, 1966 BSA Lightning, 1966 Cb450 Bomber

Re: 78 GL1000 No headlight

Post by fatalbert »

If both low and high beam filiments are open (burned out) it would give you similar results. I assume you know the bulb is still good? I chased a problem with a poor running Mga over the summer because one of the new spark plugs I installed was bad. This was after rebuilding the carbs, etc.
ARCPrez
Posts: 4
Joined: Sun Apr 14, 2019 12:45 pm
Location: Regina,SK, Canada
Motorcycle: 1978 GL1000 - Daily rider
1979 GL1000 - parts donor
1984 GL1200 Aspencade -Project
1987 GL1200A Aspencade - setting up for touring

Re: 78 GL1000 No headlight

Post by ARCPrez »

After fiddling for the last few hours it is definitely a bad connection in the switch looks like I'm going to have to replace it.
Thanks for your insight everyone.


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