So I'm trying to impress the boss, long story short I need to fix our 2013 cat 2.2 powered stump grinder. It's not charging, the battery is fine, connections on batt and alternator are fine, accessory belt is tensioned. Fires up great, but charging light doesn't go out and s 11.5v at the batt and the same at the alt. Now if I hit the field wire with 12v it starts charging. My question is where does the field wire go? Is it a relay? Fuses are good btw. The field wire only gets voltage for a second right? Were do those magic pixies come from??? Tomorrow I'm going to check all connections on the back of the ignition. Thanks guys(and gals)!