I need help, I need to replace my main alternator wiring, I’ve tried everything other than this and it shows so far that my alternator wire is bad. New battery, new alternator… new controlling wired, new grounds. The only wire I haven’t replaced is the main power wire. That is because I have no idea how, it seems like the wire goes under the engine or behind it, any suggestions/help from anyone?

2.5L I4 ford ranger 98

 

On the outside edge of the Engine Fuse Box there should be a MEGA Fuse mounted, 125amp or 175amp

Battery Positive wire will be connected to one end of that MEGA fuse
OTHER END of the fuse should have TWO wires, one goes inside the Engine Fuse box, the other goes to the Alternators B+ terminal, the largest wire on alternator

Alternators other wires, on the 2 or 3 wire connector
Yellow wire goes to engine fuse box ALT SYS fuse, always has 12volts
Light green wire goes into cab, from Battery Light in dash, this is the ON/OFF switch for alternator, should have 12v with key on

May or may not have a white jumper wire, loops back to single spade terminal on alternator