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There is a lot of places, Just choose one that is more convenient.

Just make sure that there is a direct connection to the block and not the wrong side of an engine mount. These are made of rubber and isolate the block electrically as well as mechanically.

The idea really, is to get most power to the starter motor. The motor is bolted directly to the block, without insulating gaskets.

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Q: How do you ground a jumper wire to engine block?
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