Question about 1978 Suzuki GS 750 E

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I am having a problem locating an electrical problem. When I check the battery with the key switched off, I get a 12.47 volt reading, when I switch the key on the volts drop to 1.35 and when I press the horn it drops to 0.68 volts. Anyone have an idea of what the problem might be. I thought it might be a short in the ignition switch but that would preclude the voltage drop by using the horn. Anyone??

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  • topjack57 Jul 03, 2009

    I just put a new battery in the bike. It did the same thing when I had the old battery in place. When I try the horn and starter while the battery is charged and the charger is still connected, I noticed that the dash lights are brighter. Any ideas?

  • topjack57 Jul 03, 2009

    I just put a new battery in the bike. It did the same thing when I had the old battery in place. When I try the horn and starter while the battery is charged and the charger is still connected, I noticed that the dash lights are brighter. Any ideas?

  • stefz34 May 11, 2010

    Have you had the battery load tested, sounds like you could possibly have a battery with a bad cell in it.


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If your battery is good...
something is draining it badly.
You could remove fuses, and see if the condition goes away, then replace one at a time. (I think you see my method of madness)
If not, go deeper, like unplug a wire harness, remove a starter cable, etc....
Good luck

Posted on Jul 03, 2009

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