Oh they were cut way back at the stator? the yellow (yellow w/ red) depending on year, goes to reg. & T's up front to power up the switch.
According to clymer DCV(but ive seen misprints) just try it on ac & dc ...with it running of course
If nothings good, cut & ohm y or y/r & black , it should be between .26-.38 ohms...not running, cold
Yes you need a regulator & seal up those butt connectors!