Looking for an electrical diagram for a 1985 GL1200A


Information and questions on GL1200 Goldwings (1984-1987)
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gsbuilder
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Motorcycle: 1985 GL1200 Aspencade

Looking for an electrical diagram for a 1985 GL1200A

Postby gsbuilder » Tue May 17, 2011 10:08 pm



I'm looking for a diagram for the 1985 GL1200A Ignition circuit. The symptoms are that Key on, fuse is fine. Turn the engine over and the circuit blows within a rotation or two. Symptoms started after pulling carbs multiple times. Fixed the fuel problem, started an ignition problem.



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WingAdmin
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Re: Looking for an electrical diagram for a 1985 GL1200A

Postby WingAdmin » Wed May 18, 2011 7:55 am

Assuming the problem is related to your pulling the carbs, I'd start looking for a pinched/shorted wire, likely between the keyswitch and the starter solenoid.

You could remove the ignition wire from the starter solenoid and trigger the solenoid instead with a wire connected to the battery (i.e. "hotwire" the bike). You'll probably want to use a fused wire to be safe, considering the nature of this problem. If it operates correctly, you can rule out the solenoid.

You could also, after removing the wire from the starter solenoid, check the resistance between that wire and ground - it should be infinite (open). If you've got it showing anything else, it indicates that wire is shorted out somewhere between there and the keyswitch.

gsbuilder
Posts: 9
Joined: Mon Mar 21, 2011 8:09 pm
Location: West St Paul
Motorcycle: 1985 GL1200 Aspencade

Re: Looking for an electrical diagram for a 1985 GL1200A

Postby gsbuilder » Wed May 18, 2011 8:01 am

I tried jumping the solenoid (hotwiring the bike) and the fuse blew just the same. I don't think the short is in the starter circuit, but the actual ignition circuit. Somewhere between pulse generators, coils and ignition module. The bike ran yesterday, but was pouring fuel out. I removed carbs, fixed the floats, reinstalled and bam, bad fuses.

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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Looking for an electrical diagram for a 1985 GL1200A

Postby WingAdmin » Wed May 18, 2011 8:38 am

That makes a bit more difficult. I think the first thing I would do would be to disconnect all of the components on that circuit and try cranking again to see if it still blows the fuse - if it does, then that rules out the components, and points to a short in the wiring harness somewhere. If it no longer blows, then start reconnecting the components one by one to see which one causes the fuse to blow.

racetteb
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Re: Looking for an electrical diagram for a 1985 GL1200A

Postby racetteb » Thu May 19, 2011 10:35 pm

If you're blowing the fuse when just jumping straight to the starter, could be a ground somewhere on the starter circuit. If you have access to a cheap-o ohmmeter, can be of a great value to you. I would start by pulling the positive battery terminal and engaging your start switch with the key in the on position, see if you get a dead short to ground - IE less that 1ohm resistance or around about that range, if you read any higher, like 5 ohms or more, or an infinite reading, chances are it's not there. Then from there can start adding more to the circuit....In terms of the prints for the starting circuit, you can find them online, just google a 1200 Interstate Hanes manual, mine came with all of the wiring diagrams and prints in the back. Good luck.

gsbuilder
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Location: West St Paul
Motorcycle: 1985 GL1200 Aspencade

Re: Looking for an electrical diagram for a 1985 GL1200A

Postby gsbuilder » Fri May 20, 2011 6:23 am

I found it, it was the fuel pump. The winding inside is shorted, so when the ignition module pulsed the coils (where the fuel pump gets it's power from), the fuel pump drew more than 10 amps and popped the fuse.




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