Assuming you still read 12.9 or so on the battery posts ....
Turn on the headlights.
DId they come on?
...If no, use multimeter to measure from the middle of the + post on the battery to the battery cable attached to the post. Anything more than 0.1 volts indicates a poor connection between the + post and the cable.
................use multimeter to measure from the middle of the - post on the battery to the battery cable attached to the post. Anything more than 0.1 volts indicates a poor connection between the - post and the cable.
...If yes, try to start the engine while watching to see what the headlights do.
Report results.
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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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