cyipher

iTrader: (1)

Im having an issue with my alternator always being excited, the alternator is a truck style 4 pin unit. The factory wiring for the alternator has not been changed and the ecu controlls the alternator fine with no check codes.

I did a volt test and am getting 2.75 volts on the brown indicator light wire when the ignition is off, if I disconnect this wire the alternator is no longer excited. There is no voltage on the field duty cycle wire.

Help!

S10xGN

iTrader: (11)

Well, it looks like you have an engine swapped Mazda, so I'm gonna guess that at least some of the wiring has been modded. The brown exciter wire needs to come from a "key-on" source, so check there first...