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Farmall & IHC Tractors Discussion Forum
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A circuit making battery dead

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Jim Isler

01-13-2004 09:38:55




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I'm bringing back a 1939-45 A with electric start, generator and a regulator put on at some point.

Problem is that when I hook up the battery, there's some sparking indicating a circuit. I can't find out where, since the mechanical switch for the starter should be the only way (lights not being connected and no wires touching metal)

Any clues?
Thanks




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Michael Soldan

01-13-2004 17:47:38




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 Re: A circuit making battery dead in reply to Jim Isler, 01-13-2004 09:38:55  
Jim, just a friendly reminder that the A is a positive ground tractor..you may already be aware of this..good luck...Mike in Exeter Ontario



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Bob M

01-13-2004 10:42:13




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 Re: A circuit making battery dead in reply to Jim Isler, 01-13-2004 09:38:55  
Jim - Good chance it's a failed voltage regulator. Try this first: Leave everything else connected but remove the wire on the BAT terminal at the regulator. Now try reconnecting the battery again. If you get no spark now, the regulator is the problem.



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Gibby

01-13-2004 10:01:57




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 Re: A circuit making battery dead in reply to Jim Isler, 01-13-2004 09:38:55  
Whew... The worst of all worlds. What I have seen in the past - everything dis-connected - ignition switch off - You have a high resistance short. And the bad thing is it could be anywhere in the harnesss - starter - key switch. What usually is the cause is a corrosion run going from positive to negative. Best place to start is to disconnect the key switch. Mark all the wires before you do it. Then if the spark is still there disconnect the gauges - one at a time. Then the starter, regulator - generator. Then when nothing is connected to the harness - you have a identified a shorted harness. Sorry for the long winded trouble shooting process. But after 40 to 50 years of water & fertilizer - cracks in the insulation - this is not uncommon.

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