Gl1000 no power to headlight...


Information and questions on GL1000 Goldwings (1975-1979)
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80corvette999
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Gl1000 no power to headlight...

Postby 80corvette999 » Tue Apr 08, 2014 2:55 pm



I have changed both right and left handlebar switches and still have no power to headlight.
I have power to headlight fuse.
Headlight was "hard wired" when I got the bike.
I have traced the wiring the best I can from the wiring diagrams.



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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Tue Apr 08, 2014 3:44 pm

The headlight circuit is simplified in the following schematic....power from the fuse goes to the start button...when not pushed it goes directly to the hi/lo switch and then directly to the lamp....
Do be aware of the need for a ground for the headlight too...

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Tue Apr 08, 2014 4:23 pm

I'm not that good at wiring. I have power to the fuse, does that mean the switch's are good?

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Tue Apr 08, 2014 4:28 pm

No.power leaves the fuse and goes to the start button first then to the hi/lo switch.

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Tue Apr 08, 2014 6:40 pm

Thanks for replying.
Sorry but when I look at it the wire runs from the ignition switch to the starter switch then to fuse, then to high/low switch.
I'm thinking I have a ground problem, except the headlight comes on if I run a wire from fuse direct to the headlight, using the green wire connected as a ground.
I have replaced the high/low switch.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Tue Apr 08, 2014 6:45 pm

My bad...your right...If youhave volt on the fuse the start switch is OK.
It leaves that switch and goes to the hi/lo switch and then to the light.
Get to the wiring in the headlight bucket.You can find the hi/lo wires in there from the switch.

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Tue Apr 08, 2014 8:59 pm

Ok, thanks.
Do you know anyone in the Denver area that works on the old wings?
The honda/harley dealer here wants 90 bucks and hour, and who knows if he could even
find the problem.
I had to replace the headlight pigtail so I know what wires you are talking about in the bucket.
Blue is highbeam
White is low
Green is ground.
Can you tell by the diagram, is the hot wire from the fuse block to the high/low switch, black with yellow strip?
Again, thanks for your info.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 8:11 am

Yes on the black/yellow.test light probe it to see if it has power,then move the test light to white wire for low beam and blue for hi beam

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Wed Apr 09, 2014 9:56 am

I have 10.8 v at fuse, 10.6v to blue/white wire that feeds the h/L switch and 10.6 at both high and low switch wires when switched.
Could I have the voltage there and not enough current due to bad connection?
All the connectors look clean.
I checked my 76 gl1000 and have the same 10.8 at the fuse. with good batteries in both bikes.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 10:48 am

Even 10 volts would light up the light.I suspect that your using the frame as a ground for your meter.
If there's 10 volts at the headlight plug, measure the green wire at the same time.It should be zero volts.if it is,replace the lamp.If the green wire has volts,the ground is bad.

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Wed Apr 09, 2014 4:18 pm

I have strange things going on.
I have 70 mil volts on the green ground wire in the bucket.
I hooked up a ground wire from the frame to the headlight plug to eliminate a ground issue.
I have 10.8 v on blue wire till I hook up the headlight then it goes to 5 v.
The 10.8 goes to 0 v when I switch to low beam, which it should, telling me the switch works.
The feed wire to the h/l switch also goes to 0 when I hook up the headlight.
yesterday....the headlight did come on twice for about 15 sec the go out.
I have checked the headlight on my other bike and it is good.
Now, I just hooked up a wire from fuse to the feed wire to the switch....now the headlight works.
Must be a bad connection in the black yellow wire from the fuse to the blue/white wire that feeds the switch.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 4:25 pm

Ok.now you got it.the volts go away when the lamp is attached.
I'll bet 3 cents that it's getting lost in the start switch.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 4:27 pm

The start switch feeds power to the hi/lo switch until it's pushed in to crank the engine.

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Wed Apr 09, 2014 4:35 pm

Even if it stays at the fuse?

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Wed Apr 09, 2014 4:37 pm

I guess i'll just run a wire from the fuse the the hi/lo switch and bypass what ever is defective if I can't find the bad connection.

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virgilmobile
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Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 4:42 pm

Or disassemble start switch and clean the contacts

80corvette999
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Re: Gl1000 no power to headlight...

Postby 80corvette999 » Wed Apr 09, 2014 5:08 pm

That switch is new.
Anyway, do you see any harm in bypassing some connections?

Thanks for all your help.
You gave me the drive to keep at it.

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virgilmobile
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84 GL 1200 I

Re: Gl1000 no power to headlight...

Postby virgilmobile » Wed Apr 09, 2014 6:18 pm

No harm.The only purpose of that part(switch) is to shut off the headlight during cranking.
There are other methods to do that if needed.
So somewhere from the fuse to the hi/low switch,its bad.!!!
You know,now that you know where to test for volts while the light is on,check both sides of the fuse.well not so much the fuse but the metal where it snaps in.Ive seen rust there.Unloaded(no lamp) volts can get through but loaded and it falls flat.
Fuses can have cracks too.they show volts on both sides till the load is hooked up and then it quits.

Also ignore my last post.I forgot again,,the fuse is after the start switch..My bad again.Sorry.




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