If engine didn't start
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(relay click or less), then disconnect you battery and check voltage across terminals: should be 12.x volts.
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If correct, reconnect car to battery and check again: if voltage drops right down, then you have a short somewhere.
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.
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.
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.
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?
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Could be your starter motor solenoid has jammed.
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.
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.
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.
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.
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Or one of the main relays is defective
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/ major fuse has blown
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Possibly even a short-circuit diode in the regulator
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(alternator)?
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I can't remember any of the relay locations, as I have not got a schematic
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handy.
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.
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.
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.but for so much NOT to work its going to be something near the front of the power circuitry,
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the battery
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/ charging
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/ starting circuit: either a relay or fuse.
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hth?