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Reply to "71 Pantera spark comes and goes?"

quote:

Originally posted by Al SPODEN:

... I know the issue lies with that resistor..my thought is get a new one..what do you think..any ideas ...



Al, the dual resistor is an oddball set up found on 1971 - 1972 Panteras. One of the resistors is wired between the coil positive and the battery power, the other is wired between the coil negative and the distributor (breaker points). This places the coil primary in sries with the two resistors, smack dab in the middle between them. The sum total of the two ballast resistances was 1.35Ω. The coil had 1.47Ω primary resistance, 8,200Ω secondary resistance. I've never seen this split ballast resistance set-up in a Ford (but my memory is faulty these days).

The whole thing was replaced with a standard set up in mid-1972 (Pantera L models), a 1.35Ω resistance wire was inserted in the wiring harness between the coil positive and the battery power, no resistance between the coil negative and the distributor.

I seriously doubt the new ignition needs to split the ballast resistance ... perhaps it needs a different amount or none at all. I would think the new ignition would have came with a new ballast resistor. No?

I am not familiar with the ignition you purchased. My only advice is to wire the ignition power circuit exactly as the manufacturer instructs, assuming the manufacturer provided instructions. Proper resistances, etc.

-G
Last edited by George P
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