Assuming points ignition, with the key on, the engine NOT running and the points open, the + terminal of the coil should read battery voltage to ground. With the points closed the + terminal of the coil should read around 8 or 9 volts to ground.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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