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Re: john deere A do i need a resistor

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09-10-2012 10:33:55

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if battery is 12 volts and coil is 6 volt or marked "12 volt external resistor required" (1 1/2 ohms across coil primary) yes you need a resistor. Resistance of the resistor should equal resistance of coil primary

if 6 volt battery with 6 volt coil, or 12 volt battery with a direct 12 volt coil (3 ohm primary) no, you do not need a resistor

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gary in neb.

09-10-2012 10:59:49

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 Re: john deere A do i need a resistor in reply to rvirgil_KS, 09-10-2012 10:33:55  
will be 12 volt bat and 12 volt coil so should be ok then. wonder why my 60 has then as it's all 12 volt.

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wilson ind

09-13-2012 16:19:18

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 Re: john deere A do i need a resistor in reply to gary in neb., 09-10-2012 10:59:49  
did you live near westcliff colorado few years ago???

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gary in neb.

09-14-2012 12:02:50

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 Re: john deere A do i need a resistor in reply to wilson ind, 09-13-2012 16:19:18  
nope. always been a nebraska boy.

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09-11-2012 06:21:53

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 Re: john deere A do i need a resistor in reply to gary in neb., 09-10-2012 10:59:49  
60 probably has resistor bypass from switch or starter. Operates on 6 volts but bypasses resistor and applies 12 volts while starter is cranking the engine to give hotter starting spark.

There is no internal resistor in the coil. The difference is in the number of primary and secondary windings.

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