Installing one wire alternator

The big thing you need to do when connecting "big" alternators--or really doing anything in that line--is to make sure the bulkhead connector terminals and the original wiring (if retained) is in good shape. Even though you are greatly reducing the strain on the bulkhead connector--by "shunting" the original ammeter--there is still current through the big black and big red wires--to feed loads in the pass. compartment.