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Re: wd wiring

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Bob Bancroft

06-17-2013 15:29:45

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Your coil should be the same polarity as your battery. So, if your batt. is pos. ground, the pos. terminal of the coil is connected to the distributor, and vice versa.

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06-17-2013 15:39:32

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 Re: wd wiring in reply to Bob Bancroft, 06-17-2013 15:29:45  
thanks that's what I thought its been backwards for 2 years, what could be damaged? troubleshooting a no spark problem?

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06-17-2013 18:32:01

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 Re: wd wiring in reply to harback, 06-17-2013 15:39:32  
Nothing damaged

A spark plug can either "spit" the spark from center electrode to grounded tab, or "suck" the spark from grounded tab to center electrode. On these old engines spark is more efficient when it "spits" rather than "sucks".

This is controlled by coil wiring. Bob has it right that coil post to distributor should match system ground polarity as this makes the plug spit the spark. Reverse coil connection and plug will suck the spark.

Tractors that I have encountered where coil was wired backward they seemed to be more stubborn to start when cold, but didn't notice a big difference when running.

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Bob Bancroft

06-17-2013 15:49:06

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 Re: wd wiring in reply to harback, 06-17-2013 15:39:32  
Could be a little hard on the points, or coil, but generally not a big deal. With battery power to the coil, you should be able to get a good spark out of it by making and breaking the circuit by opening and closing the points.

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06-17-2013 15:58:29

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 Re: wd wiring in reply to Bob Bancroft, 06-17-2013 15:49:06  
Thanks there is good spark out of coil wire no spark to any plugs thinking cap and rotor, even though they look good.

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