I'm 5 years into my build... spent the last year driving her around in fiberglass form. 2500+ miles in.
I'm on my 3rd starter. This one only lasted 1 week and it's brand new (not reconditioned). I suspect an electrical problem. I'm using a 93 5.0 Mustang donor engine, Ron Francis wiring harness.
Things I've checked:
1) New battery
2) New terminal connections, tight & clean (see photo).
3) Ran the negative ground directly from the battery negative terminal to the frame and then a grounding strap from that same frame position to the starter mounting bolt (this is my ground point) <-- If I don't do this, the crank power to the starter is weak.
4) New starter. All connections tight.
Any ideas?
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