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Allis Chalmers Discussion Forum

Messed up Ignition on an A-C B

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08-28-2003 19:29:26

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HELP!!!!!!I have screwed up!!!!!!!
I have very little mechanical ability. My on-off switch was not working.(it easily pulled in and out) I replaced it with a switch recommended by the replacement catalog. It only had 1 wire attachment. Up until this point the tractor would turn over but not crank. It has been running in the past but not for about 2 months. When I took the switch box apart, I noticed the fuse blown. I replaced the fuse and the old switch. Upon completion of installation, I tried to crank the the tractor. It sparked near the switch, blew the fuse and will not turn over at all. How can I fix this??
I want my B to run. I really enjoy playing with it.

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Doug in OR

08-31-2003 18:14:16

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 Re: Messed up Ignition on an A-C B in reply to Geenacres, 08-28-2003 19:29:26  
Are you running a magneto? The B would usually have one. The switch for a mag wouldn't go anywhere besides ground and your mag shorting bar. It would be nearly imposible to cause fuses to blow with this wired properly. Somehow, I get the feeling you got the wrong switch and tied one terminal to the mag, and the other to the ignition.

Tells us what you have and how you wired it.

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09-01-2003 17:06:35

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 Re: Re: Messed up Ignition on an A-C B in reply to Doug in OR, 08-31-2003 18:14:16  
Thanks for your response. I have very limitied mechanical ability. On the switch box below the steering wheel, there is a meter, with a switch below on the right. I thought it was a magneto switch, to the left is a switch that has two stops. I was told that this was the light switch and also charges the battery. The switch on the right has only one wire attachment. The switch pulled in & out freely with no clicking or resistance.( (I saved the old switch) The tractor would sometimes start if I jiggled the switch. I decided to replace the switch. I went to my local NAPA that carries parts and purchased a switch recommended as replacement. I replaced a blown fuse and the switch. It tried to turn over.
However, a spark occured on the fused side and blew the fuse. I noticed a bare wire touching the meter box. The starter will not EVEN turn now. No fire at all. I would love to get this B running. I hope I haven't completely destroyed the electrical system. Any help would be greatly apppreciated.
Noah in NC

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Doug in OR

08-31-2003 18:23:54

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 Re: Re: Messed up Ignition on an A-C B in reply to Doug in OR, 08-31-2003 18:14:16  
I meant to say main wiring, not ignition. This is the only way I could see how you would blow a fuse. And I suspect that this wiring arrangement caused your battery to run down

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