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1987 TA GTA: Engine Won't Turn Over But Battery Is Fully Charged

stellin

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Joined
Jan 1, 2023
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Hadn't started the car in about a year; all electrical systems are getting power as far as I can tell, but the engine won't turn over at all; I hear one (1) muffled click when I turn the ignition key to the start position, then complete silence (no clicking or engine cranking sounds).

The battery is nearly fully charged, and I connected to a 50A portable starter, and still nothing.

Do any suggestions most likely the root cause of this issue?