I spent a lot of time researching this because I was scared but to be honest it was pretty simple.

For this you will need;

  • B series charge harness
  • 4 Gauge Wire - I got about a metre of it from supercheap
  • Battery Terminals - sized for the wire
  • Heavy Duty Crimper - leverage is handy because this is a big wire, standard crimpers will not fit

charge harness diagram

Based on this diagram - the stock harness has everything, but the gauge for the Alternator -> Fusebox is too small, use 4AWG as described above

Split the Alternator -> Fusebox wire from the harness and use the rest of it as is. Measure up the distance of wire you need for the Alternator -> Fusebox wire (4AWG) and crimp both ends with the circular style terminals and hook it up into the system.

charge harness bseries

Picture of the final section of the fusebox you will use - notice lack of the white wire (alternator)

Whole process took maybe 10-15 minutes, pretty easy to do.