Join Date: Mar 2017
Location: Ojibwe Gichigami
Liked: 2768 times
Could that 4th yellow be the exciter wire color in china..? LOL :-)
You could measure voltage outputs of each of those yellows if you have a peak voltage adapter and a decent multimeter, to learn if one of them is anywhere near to 100 volts AC at cranking speed.
Anyway, there should be 6 wires in an 86/87 Fourtrax OEM stator harness. The pulse gen wire should be Blue/yellow, the ground should be Green/white, the exciter should be Black/red, with three alternator Yellows.