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Sparky’s got me. It’s the coil. Why?
I will try and disconnect the blue connector as well as tidy up some loose ends next time I’m in my garage.

Thanks so far!
While you're at it, I would try to figure out what burned the connector. That may lead you in the direction of the short.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
Well, tonight I went through a process of elimination and it’s the ignition coil that’s given up. The symptoms match with everything I know about coils and it explains why it took a bit of time before it would break down completely.

The coil’s copper wire’s coating must’ve been damaged somewhere.

This Pertronix firethrower coil (chromed version) was newly installed 18 months ago and the car hasn’t been driven a lot. I have it mounted at the front of the pass. side valve cover so it does get pretty warm.

Question 1: Is this location problematic for coils?

Question 2: What is the original location of the coil with a 351C engine?

from your description that should be the stock location of the coil. Heat does kill coils.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
You can look at the Ford pictures here, on the cover page and on page 19, in their 351C Brochure for the original position:

I have seen them mount to the front of the heads, also. I repositioned mine to the front of the passenger side shock tower, to reduce heat and vibrations.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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