79' Electrical Issues

93CalypsoConvert

Active Member
Nov 26, 2020
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38
Virginia
Well one fox just wasn't enough. I recently picked up a 79 5.0 notch that has been sitting in a field for 21 years. I've got it running and yard driving, but I'm having some electrical issues.

The first is ignition. I must hot wire the coil in order to keep it running. It gets +12 while cranking, but is lost when the key is in run position. It has an ICM (duraspark II maybe?) and a traditional coil. I'm unsure if there is supposed to be a ballast resistor in this system.

Second is power to accessories. When the key is in run, none of the electronics work (blinkers, wipers, radio, blower motor) with the exception of headlights. However, once the engine is running and alternator is turning, everything works. Battery power doesn't seem to be reaching the electronics. Battery DOES charge though...

If anyone has pictures of how the ignition is supposed to look, that would be great. Going to look though my Haynes manual tonight and see if that leads me anywhere.
 
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limp

wrap a little cheese around it and its a done
Oct 4, 2020
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Have you checked your grounds?? A 21 year field car must have a fair amount of at least superficial rust and corrosion.....
 

General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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polk county florida
I think those years suffer from the same, although less frequent, ignition switch problem, not the key switch, the one under the dash.
Also the fuse link wire at the starter may be suspect.
 
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
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polk county florida
Look under the dash on the steering column.
1660776317174.png
 
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