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Allis Chalmers Discussion Forum
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Allis B no spark

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Greg Hyov

05-25-2006 10:23:24




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I have a Allis B with no spark, I checked the keys switch and that is find, the wires running to the coil are good, I put new cap rotor and points on it last fall, This is a pretty basic system so I assume that it is the coil or plug wires?? I got a set of plug wires no biggy but the coils they have at napa for this tractor are all superseeded by another and the one I got does not have a built in reisitor, so I got a resister for it (not sure of the value). My question is which is my best option, and how do I hook up the resistor? does it go on the + or - side of the coil?

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Greg Hyov

05-26-2006 06:36:46




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
Thanks all for your help, I called napa and gave them the part number of the coil and they have fun so I am going to return what I bought yesterday. I will let you after the holiday weekend how it turned out.
Thanks
Greg



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Steve in N.J.

05-26-2006 04:52:10




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
We design 12V conversions for AC tractors. The Ignition system on a 4 cylinder engine application with a 12V conversion needs to have 2.7-3.3 ohms of resistance in that circuitry in order to establish the correct current to the points and coil for proper engine performance and Ignition component longevity. Making sure you establish this can be done in a couple differnt ways. One with a ballest resistor or with a coil with built-in resistor as SouNdguy mentioned. I always lean our customer's toward the internal resisted coils mainly because Mother nature plays havoc with ballest resistors sitting out in the open. This just causes more troubles down the road just like they did in cars year ago. Pick yourself up a coil with 3.0 ohms of resistance. This will put you right in the ballpark for the Ignition circuitry. If you have trouble finding one, we have em' in stock. Another nice addition to add to the reliability of your tractor is adding an electronic ignition and eliminating the points and condenser. This makes a more precise and accurate spark and is uneffected by the outside elements. We also have those in stock to. Good Luck! Hope you iron the ole' girl out. If you have any other questions, just drop us a line at the shop. Be happy to help ya out.
Steve@B&B

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souNdguy

05-25-2006 20:43:12




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
Put the resistor between the key and the coil.. not between the coil and the distribuitor.

Also.. call your local napa and ask for a manager, or ask for the regional manager and COMPLAIN.. I'd make them give me back my money for the non 12v coil they sold me. NAPA caries a fine 12v coil that needs no resistor.. i have one setting on my desk as a spare.. it is a NAPA IC14SB.. costs 15 bucks.. made for use with 12v, no extra ressitor needed. Your counter person was ignorant...

Soundguy

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Dick L

05-25-2006 11:54:24




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
I have a tester with a light in the handle with a sharp point at the end. has a wire with a clip comming out of the top of the handle. When I do not have spark with a distributor I start checking at the coil for power at both sides of the coil and then to the breaker points. If you only have power to one side of the coil then the coil is bad. If I have power at all check points I then check the rotor and cap. If you have power past the points and you have tested the rotor, cap and plug wires you are back to a bad coil.

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BCnT

05-25-2006 11:45:04




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
has tractor been upgraded to 12 volts?
you dont need resistor if its still 6 volt.



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old

05-25-2006 11:29:09




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 Re: Allis B no spark in reply to Greg Hyov, 05-25-2006 10:23:24  
My self I would check/clean the points first. If there a year old and it hasn't been run much in say the last month the points are probably correded. As far as wireing the coil the resister goes between the coil and the ignition switch. My self I always use a ballast resister made for a mid 70s dodge car/truck.

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Greg hyov

05-25-2006 11:48:53




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 Re: Allis B no spark in reply to old, 05-25-2006 11:29:09  
Yeah the tractor was upgraded to 12v. I did check the points and they looked good. I should of added that I was using this tractor to mow the lawn and it was running freat then just died, and wehn I checked there was no spark



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old

05-25-2006 13:29:46




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 Re: Allis B no spark in reply to Greg hyov, 05-25-2006 11:48:53  
Most of the time when a coil goes bad the tractor will run fine for about and hour then it will sputter and die. Then about an hour or 2 later it will fired back up and run fine for about and hour. I have seen times when a rotor going bad will kill a tractor and it will do what your is doing.

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