Posted by Steve@Advance on July 22, 2021 at 19:00:56 from (12.156.164.179):
In Reply to: Weak spark posted by Ted in NE-OH on July 22, 2021 at 11:23:13:
Double check what coil you actually have. Go by the part number actually on the coil or measure the ohms across the primary terminals out of circuit. Should be around 3 ohms.
Those coils are dinosaurs, often reboxed and not in the computer correctly.
Also check the distributor shaft for side play. If worn, the points will not stay set, they will arc and burn, cause the coil to overheat.
A correct coil running as it should will not be hot to the touch, should be about the same temperature as the surrounding underhood components.
Try an old condenser if you have one. The new ones are known for being bad out of the box.
To test the ignition switch, turn the engine until the points are closed, put a volt meter from the + coil terminal to ground. Turn on the ignition. The voltage should be very near battery voltage. Wiggle the ignition switch lever or key, the voltage should remain steady. Try moving the wiring harness, especially behind the switch. But work quickly, the coil will overheat if left on and grounded very long
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