How to Troubleshoot Isuzu Alternator Problems | It Still Runs How to Troubleshoot Isuzu Alternator Problems by Brooke Julia . Isuzu is a Japanese vehicle manufacturer that made its introduction into the American marketplace in the 1980s with the Pup. Its Trooper and Rodeo were popular among American buyers; but as the economy began to depress and customers turned their attention to competing companies Isuzu alternator wiring - Defender Forum - LR4x4 - The Aug 15, 2010The standard Isuzu alternator has an integral regulator which makes it even easier to wire up. Check Fig. 9 on page 6D-14 of the FSM for detailed wiring. Basically, you have three wires going to a round connector on the back of the alternator plus a heavy black wire (B) going to the output stud also on the back of the alternator.