Re: gadam05
I now have an authentic used old stock Model A coil. It works fine in its mount and also works fine when held in hand and disconnected entirely from the car except for the wires. It does not need to touch the firewall at all. BUT... earlier I had a replacement coil of uncertain vintage in my new restoration. It used a clamp mounting screw and nut to tighten the firewall mounting bracket around the coil. The clamp and firewall mount assure a good full time ground for the outside case of that coil and it did reqire grounding. After about 350 miles of initial running, vibration loosened that screw, the coil slipped down just a bit and the fresh paint on it eliminated the electrical grounding. The car stopped running suddenly and completely till the coil was repositioned and the clamp tightened. Finding that was a real mystery. The symptoms you list could be a variation of this anomaly.
By the way, I have never been clear on the wiring logic for the high voltage coil component of the coil. Wiring diagrams do not show a current source. Can anyone explain this? Rancho
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