Posted by Bob on April 21, 2009 at 08:47:33 from (69.178.228.68):
In Reply to: '55 F-100, hot coil posted by Chuck (CA) on April 21, 2009 at 08:02:03:
The coil MAY have shorted or there may be a short in the primary wiring between the coil and the breaker points. (Or, even a shorted condensor.)
Check the voltage at the DISTRIBUTOR primary side of the coil... ignition "ON", points "OPEN", points "CLOSED".
Points "OPEN"... should have battery voltage.
Points "CLOSED"... should have near ZERO voltage.
If that checks out OK, the coil is probably bad.
You need to get the correct coil... if there is a ballast resistor ahead of the coil (could be a ceramic ballast resistor or a resistance wire between the ignition switch and the coil) you need a coil marked "USE WITH EXTERNAL RESISTOR".
If there's NO resistor ahead of the coil, get a TRUE 12-Volt coil such as a NAPA IC-14SB.
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