As fat as you can make them and get them safely routed. Mr Ohm never sleeps and the cranking current is hundreds of amps. If a starting system is marginal, this is a place to look.
If you suspect iffy cables or cable terminations, put a jumper cable in parallel with the existing cable and see if things improve. If they do, you're on the right track, if not, search elsewhere.
Check the ground connection again!
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61 and 63 Originals
123 (2)
782D
106,
147, 122
102 parts
It's only original ONCE!
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