Voltage problem:12.5v to 1.5v in under 5 seconds!!


Information and questions on GL1100 Goldwings (1980-1983)
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Rokon
Posts: 17
Joined: Fri Nov 21, 2014 10:48 pm
Location: Tacoma, Wa
Motorcycle: (3) 1983 GW's: Aspy, Interstate, Standard

Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby Rokon » Fri Jul 17, 2015 7:31 pm



Nasty voltage drop issue here.

Brief history: I removed the tank and reinstalled it. Cleaned up the wiring, but didn't touch ANY of the factory wires. Removed cleaned and reinstalled the carbs. I just removed all the extra lighting accessory wires as well. Bike ran before starting repair work.

Here's the problem. When the key is switched to the "on" position the battery gets drained immediately. Even with a 15A car charger the voltage drops as soon as the key is turned. I didn't see or smell anything burning. Is there anything in the system that can drain the voltage like this?



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Aussie81Interstate
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Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby Aussie81Interstate » Fri Jul 17, 2015 7:44 pm

Does the battery recover by itself to over 12V when the key is turned off?

IF you are saying that without starting the bike when you turn the ignition key to "ON" and the battery voltage under no load drops from 12.5 to 1.5V in under 5 seconds - your battery is stuffed OR you have a major electrical fault that needs to be resolved very quickly.

How old is your battery?

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Aussie81Interstate
Posts: 682
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby Aussie81Interstate » Fri Jul 17, 2015 7:46 pm

I would start by disconnecting all your fuses and know which systems operate - and try a process of elimination.

Did you disconnect the battery during the tank removal/install?

Did you just remove the tank Shelter or the fuel tank itself ??

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Rokon
Posts: 17
Joined: Fri Nov 21, 2014 10:48 pm
Location: Tacoma, Wa
Motorcycle: (3) 1983 GW's: Aspy, Interstate, Standard

Re: Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby Rokon » Fri Jul 17, 2015 9:46 pm

Battery is a year and a half old. It's been on a tender while the other work has been going on. Battery does not recover, at least not immediately. Yes no load.

Pulled the metal tank out of the frame for cleaning.

bigbugshurt
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Location: Lawrenceville Va
Motorcycle: 1980 gl 1100 standard "patch" ;-)

Re: Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby bigbugshurt » Mon Jul 20, 2015 12:28 pm

May I suggest taking the battery to a auto parts store or a walmart and have it tested. Not even a load tester will kill even a fair battery that fast!....I assume your are taking the voltage reading directly from the battery posts (the lead part), and not from the harness somewhere....?
If that were a short and not a bad battery, I think you would absolutely see smoke!
I think some automatic charters can act funny also-esp if they are "tired".
.....sounds like a bad conection though-frame ground maybe....

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Rokon
Posts: 17
Joined: Fri Nov 21, 2014 10:48 pm
Location: Tacoma, Wa
Motorcycle: (3) 1983 GW's: Aspy, Interstate, Standard

Re: Voltage problem:12.5v to 1.5v in under 5 seconds!!

Postby Rokon » Mon Jul 20, 2015 5:47 pm

As suggested, I took the battery in for testing. Under load it takes a dump. :?

Got a new battery and I'm back in business. Thanks for all your suggestions and help. 8-)




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