Re: 55 400 coil heating
Posted by HH56 On 2017/7/31 10:48:51
The V8 coil feed is from the ignition switch to the ballast resistor and then to the coil. There is a secondary feed directly from an aux contact on the solenoid which provides a straight 12v to bypass the ballast resistor and produce a hotter spark during starting. That feed is only present when the starter is engaged. Once the solenoid drops the starter out it also drops the extra feed to the coil and the coil then gets only the reduced voltage thru the ballast resistor.
On automatic transmission cars, the other coil terminal goes directly to the distributor where the points connect to ground to complete the circuit. On overdrive cars, in addition to the distributor wire there is another wire on the second coil terminal which will also connect to ground during kickdown. If there is a problem in that circuit it can also keep the coil energized and getting hot.
If the coil gets cool by disconnecting the distributor I would suspect either the points are not opening or else during the work inside the dist the small flexible cloth covered wire between points and the outside terminal has lost a chunk of the old fabric insulation and has become grounded. That has happened to more than one person on the forum. There is also a slim but still possible chance the new capacitor is shorted.
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On automatic transmission cars, the other coil terminal goes directly to the distributor where the points connect to ground to complete the circuit. On overdrive cars, in addition to the distributor wire there is another wire on the second coil terminal which will also connect to ground during kickdown. If there is a problem in that circuit it can also keep the coil energized and getting hot.
If the coil gets cool by disconnecting the distributor I would suspect either the points are not opening or else during the work inside the dist the small flexible cloth covered wire between points and the outside terminal has lost a chunk of the old fabric insulation and has become grounded. That has happened to more than one person on the forum. There is also a slim but still possible chance the new capacitor is shorted.
Attach file:
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