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Allis Chalmers Discussion Forum
:

Allis B ampmeter not reading current

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Al S

05-14-2008 13:29:27




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Light switch operates the lights: however, no + or - movement in the needle. Have slaved a new guage to it, and at high idle still no movement. Battery stays up on its own (so no short)! Generator puts out 6v to light up a test light. At low idle and operating the light switch, one can hear engine load when generator cuts in. Light switch is supposed to read: low charge, high charge, and operate lights. What is the most likely problem ?

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John T

05-15-2008 05:48:20




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 Re: Allis B ampmeter not reading current in reply to Al S, 05-14-2008 13:29:27  
If your charging system uses a simple 2 wire Cutout Relay and the combination Low/High charge and light switch YES it should charge at a low rate on LOW and a higher rate on HIGH. For that to happen the light switch needs a good ground, be working, and the wire from the gennys FLD post wired to the switch correctly.

If you temporarily jump the gennys FLD post dead to ground that should make her full/high charge and if it does but NOT when using the switch, the switch is bad or miswired or not grounded or the wires bad from genny to the switch.

As posted below an ammeter wont read the correct charge into the battery or out of it unless the battery is on the Supply side while the gennys output (its ARM post via the cutout relay) is on the other Load side.

Regardless if the ammeter is wired right or works if she is indeed charging the battery voltage should rise from 6.3 volts setting (or low idle) to 6.5 to the 7 range at wide open..... John T

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John T

05-15-2008 05:46:33




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 Re: Allis B ampmeter not reading current in reply to Al S, 05-14-2008 13:29:27  
If your charging system uses a simple 2 wire Cutout Relay and the combination Low/High charge and light switch YES it should charge at a low rate on LOW and a higher rate on HIGH. For that to happen the light switch needs a good ground, be working, and the wire from the gennys FLD post wired to the switch correctly.

If you temporarily jump the gennys FLD post dead to ground that should make her full/high charge and if it does but NOT when using the switch, the switch is bad or miswired or not grounded or the wires bad from genny to the switch.

As posted below an ammeter wont read the correct charge into the battery or out of it unless the battery is on the Supply side while the gennys output (its ARM post via the cutout relay) is on the other Load side.

Regardless if the ammeter is wired right or works if she is indeed charging the battery voltage should rise from 6.3 volts setting (or low idle) to 6.5 to the 7 range at wide open..... John T

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Bob Bancroft

05-14-2008 17:14:43




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 Re: Allis B ampmeter not reading current in reply to Al S, 05-14-2008 13:29:27  
Either wiring or a bad ammeter. Wire bringing voltage from the batt. should be alone on one side of the ammeter. Wire from gen/cutout should be on other terminal along with any load wire. Then all you are measuring is what is coming from the batt.( Or going to it when charging.) Pull the lights on with the engine off. You should get a discharge. If you show charge, switch the wires on the ammeter. If ammeter shows no response- get a new one!

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