Thread: New wiring harness, with size?

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Originally Posted by Sherlock_Holmes

Main power 8 awg

Depending on the length of the wire, #8 will usually not be large enough for the Main Power from battery to starter. In most cases #2 is a better choice for the battery to starter, with even larger wire sizes sometimes preferred here.

And, as 34_40 pointed out depending on accessories used and the length of the wire, #8 is usually more than enough for feeding the fuse box and alternator feed, with #14 OK for most accessories.

While making a wiring harness can be fun, it requires a little knowledge and planning, there are several sources on the net for wire gauge/current charts that will help you. And, remember in most areas on the vehicle high temperature/severe condition wire insulation is required, and lots of labeling.

However, I agree with rspears, the safest, least expensive and easiest is a complete wiring harness. Whichever way you decide to go, I suggest you figure the total load and individual load requirements first..