Our dual battery wiring system features 2/0 awg marine grade battery cable for the batteries, and battery to starter, and 6awg cable for the alternator charging. This allows for quicker starting, and use of a higher amperage alternator if desired.

Fitment notes:
Fits all 1994-2004 H1 Hummers with 6.5 or 6.5TD engines (dual battery setup in the tray on the passenger side engine bay).