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Allis Chalmers Discussion Forum
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Electrical Troubleshooting

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Greg Ballantyne

08-18-2004 11:55:45




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I've got a 1949 B with generator/distributor setup. Yesterday it stopped running while in use, wouldn't start again. I use the hand crank as my starter won't extend to the flywheel anymore, just spins. The shaft shoulder has ground into the underside of the nut on the extension rod, but thats another issue. I also have trouble with batteries sometimes, they don't last that long after I grounded the battery to the battery box a couple of years ago. Charging switch no longers appears to work, and the meter needle does not move any more. This time its not the battery, I am not able to see sparking in a wired plug resting on top of the radiator while turning the crank. I guess I'm asking for some pointers on narrowing in on the trouble spot without getting new switch box, wiring harness, coil, etc.. to be sure I'm getting spark at the plugs. Any suggestions?

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Steve in N.J.

08-24-2004 21:04:42




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 Re: Electrical Troubleshooting in reply to Greg Ballantyne, 08-18-2004 11:55:45  
Greg,
If you need a wiring system, OEM 3 position switch, or any of the electrical components that make up the system, drop us a line. We have everything in stock to help you get yer' little B back on track and working properly again....
Steve/B&B Custom Circuits



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steve(ill)

08-18-2004 15:20:21




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 Re: Electrical Troubleshooting in reply to Greg Ballantyne, 08-18-2004 11:55:45  
the generator and light switch have nothing to do with starting the tractor or making the spark. if you have a distributor, you have a coil. there is a hot wire (6 or 12 volts) connected to the coil, the other small wire goes to the distributor and is connected inside to the point.--- if you have power to the coil + terminal, then the coil is bad, or the point is burnt. replace both and you will be ok.
----- the charging system uses the generator, light switch and battery to keep the battery charged. to test the generator, ground the "F" terminal on the generator and start tractor. then measure the voltage output across the "A" and "F" terminals. if you get voltage, then the generator is o.k. and the light switch or wiring needs help. if you have too much wrong you might want to look into an alternator.

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Greg Ballantyne

08-18-2004 17:58:02




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 Re: Electrical Troubleshooting in reply to steve(ill), 08-18-2004 15:20:21  
I replaced the coil, and got spark at the plug. That coil wasn't that old, but was made in Mexico. I out an AGCO made in USA coil in today. On my tractor there is a "kill" switch mounted in the switchbox, malfunction of that switch could also prevent power to the coil. Evidently that switch is still good. I have other charging issues on the tractor that could require replacing the charging(light) switch and/or generator cut out relay, but that's another problem I'll look into later. I'll have to look into what the A and F terminals are to start with, I guess I've got a lot to learn when it comes to the electrical stuff. Thanks for the suggestions.

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steve(ill)

08-19-2004 16:21:45




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 Re: Electrical Troubleshooting in reply to Greg Ballantyne, 08-18-2004 17:58:02  
there are two small screwed terminals on the generator. next to them is punched a "A" and "F". ---connect the "F" to the tractor frame (ground)
--- connect the "A" to one side of the amp meter
---connect the other side of the ampmeter to the negative side of the battery.
---connect the positive side of the battery to ground.
--start tractor and see if the amp meter is reading charge. when motor is "off" you need to remove the "A" wire off the generator terminal so it will not discharge the battery, or tray to motorize the generator.--- that is what the cutout relay does.
--the light switch is a complicated way to ground the "F" terminal of the generator.

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Gerald J.

08-19-2004 07:56:25




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 Re: Electrical Troubleshooting in reply to Greg Ballantyne, 08-18-2004 17:58:02  
That "Kill" switch is probably left over from a magneto ignition. Its wired to short the points, the way to kill an engine with a magneto.

It will KILL the running of the battery ignition engine too, but if left in the kill position it will drain the battery through the coil while overheating the coil. It shouldn't be there on the battery ignition engine.

Gerald J.



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