Alternator Wire Gauge Chart

Alternator
 

Any time you upgrade your alternator, you should also strongly consider upgrading the gauge (size) of the wire that charges the battery as well as the fusible link in case of a short.

The chart below charts the gauge wire required based on alternator amperage output and length of wire.

Alternator Output (Amps)Wire Length
 4 ft or less4-7 ft7-10 ft10-13 ft13-16 ft
20 or less1412121010
20-351210886
35-50108866
50-6588644
65-8566442
85-10566422
105-12544422
125-15022220