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Allis Chalmers Discussion Forum
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charging issues

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Author  [Modern View]

05-09-2014 14:48:52

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Hi all, my 1961 d17 diesel isnt charging. The batteries are new as well as the cables. I"ve never had to diagnose anything with a generator. Just wondering where to start. Thanks

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John T

05-10-2014 06:57:38

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 Re: charging issues in reply to d17man, 05-09-2014 14:48:52  
You state " I"ve never had to diagnose anything with a generator. Just wondering where to start."

Well, if it"s an A system which I believe it is, here"s more then you may ever want to know about how to troubleshoot the system.

John T

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05-09-2014 20:11:36

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 Re: charging issues in reply to d17man, 05-09-2014 14:48:52  
Ground the "F" terminal on the generator and then check voltage output between "A" and "F" while motor is running. Should be above battery voltage. If there is voltage, then regulator is your problem.

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05-09-2014 19:53:28

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 Re: charging issues in reply to d17man, 05-09-2014 14:48:52  
if you are not safe with that take it to a auto parts store they test for free

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05-09-2014 16:50:31

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 Re: charging issues in reply to d17man, 05-09-2014 14:48:52  
start with a motor test of the genny, thenmove to a full field test.

and to dothat.. you need to determine if A circuit or B circuit.

look at the bottom of the reg. if there is 1 bias resistor and it is between the field tab and the ground tab/case.. it is likely A circuit.

if there are 1 or 2 or more bias resistros... and one is from field to armature.. it is likely B circuit.

to motor test A ckt, slip belt off.. remove feild wire.. jump field on genny to ground, jump bat hot to armature. if she takes off spinning.. genny is PROBABLY ok..

to motor a B circuit, slip belt off, remove field wire. jump bat hot to field AND armature.

if it spins, it is PROBABLY good.

post back

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