Power cord
10 gauge wire will carry 30 amps, 8 ga is rated for 40 amps. I would buy what is called "SO" cord from Home Cheapot or Lowes and then add the ends for your connections.
You can buy ready made cords for your purpose, they just cost a bit more.
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John & Lisa
2008 F450 | 6.4 PS | full delete | FASS system
2nd Montana - 2018 3811MS
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