Posted by jdemaris on December 11, 2010 at 05:48:24 from (67.142.130.32):
In Reply to: starts AFTER cranking posted by realolman on December 11, 2010 at 04:18:33:
Very common, especially is cars and trucks from the 60s-70s.
Two possible causes.
#1 - keep in mind that when you are actually cranking, system voltage can drop to 9 volts - and some coils don't work at 9 volts. The instant you stop cranking - voltage spikes up to 12 volts and it fires. This is why it is best to have a 6 volt coil in a 12 volt system. Most do. 90% of all cars and trucks that came new with 12 volt systems use 6 volt coils. Same goes for many tractors.
#2 - as already mentioned - you might have a resistor bypasss or resistor problem - if you have one installed.
Need more specifics on exactly what you have. 6 volt of 12 volt coil??
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