Not Ranked
You should run a minimum of a 0. You would be best to run a 00 for the heat issue under heavy current loads. Make sure that your connections are crimped well and sealed. A solder pot would work best combined with heat shrink over the actual joint. Make especially sure that you have established bare metal clean grounds and seal the ground point with a conductive grease meant for electrical connections, I would be surprised if you couldn't get a small tube of this at NAPA.
John
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