Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Double check the battery power feed cable at the starter is not contacting the ignition feed wire to the starter or post as this will cause this issue here and this will need corrected.If this is all o.k. and your old and new starter both acted up like this here this can indicate a fault with the starter/crank relay itself with it needing replaced.I have seen this relay stick on causing this issue here.If you need the location of this or any testing info on this here let me know so we can continue.
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If you disconnect the ignition wire from the starter ( the smaller of the 2 wires) does the starter still crank over on its own?
O.k.,let me know what you come up with here when your ready.With the relays removed and the fuses pulled it should not crank over unless this ignition wire is shorted somewhere in the wiring harness to where it is shorted to battery voltage causing this fault here.Let me know what you come up with here when your ready.
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