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Allis Chalmers Discussion Forum
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electical short in ca

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Mike in Ohio

04-01-2007 06:53:26




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We finally got dads wd45 alternator straightened out. Now for the ca, Generator was rebuilt last fall (it is still 6 volt) battery new last spring I think. Shows that it is charging on the low setting about 3-4 amps, on the high setting 12-15 amps. Voltmeter shows 6.4 volts across the battery with tractor not running and about 6.6 or 6.7 when running. After setting for about an hour or so the battery is completely dead. there has got to be a drain somewhere I'm thinking in the light switch, but need other ideas to check too. Thanks alot Mike

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Steve in NJ

04-04-2007 04:53:24




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 Re: electical short in ca in reply to Mike in Ohio, 04-01-2007 06:53:26  
On the 6V systems, the Reverse current relay or "cutout" as it's known to the industry is usually the culprit to this particular problem. The cutout's purpose is to take the battery out of the system after the tractor has been shut off so the Gennie doesn't act like a Dynamo and start draining power from the battery as it sits. This doesn't eliminate the battery from being the problem either. An internal short due to sulfating in the battery could be the batteries own demise to, even when the charging system is doing it's job correctly. I would first do a draw test on the battery, and then go downstream to the cutout. If the battery tests out okay, fully charge the battery, and then disconnect the battery circuit to the cutout relay. If the battery still is fully charged after an hour or so, you're on the right track to finding the culprit in that circuit. Another quick way to check the cutout is feel. If the cutout is warm or hot to the touch after the tractor is shut down, it's a good indication that it could be the culprit. This doesn't always apply, but I've seen on occasions that it does happen if the cutout is shorted inide. A bad field coil in the Gennie could also cause this same type of problem. Might be a good idea to have the Gennie checked for any abnormal draws at a rebuilders shop. HTH
Steve@B&B

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Kent of SWMO

04-01-2007 14:20:36




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 Re: electical short in ca in reply to Mike in Ohio, 04-01-2007 06:53:26  
Is the Cut-out relay sticking? With a charged battery connected to the tractor, remove the belt from the generator. If the cut-out relay is sticking closed the generator will motor.

Kent



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old

04-01-2007 09:49:23




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 Re: electical short in ca in reply to Mike in Ohio, 04-01-2007 06:53:26  
About the only way to find that is with a volt meter and then pull one wire at a time, on each wire check for a voltage reading if you get one then you know where to look to fix the problem



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