Are you gonna tell us the year/ make and model of the car you are working on or are we going to have to beat it out of you?
The blue VR wire must go to switched ignition
The green VR wire must go to one terminal of the alternator field
That flat VR is 70/ and later. That means you must use an alternator with an isolated field, IE 2 field terminals. One terminal goes to the VR green, the remaining one hooks to switched ignition
IF YOU ARE USING the original type wiring it is imperative you check for voltage drop With key in "run" and engine off, connect one meter probe to the blue field wire on the alternator. Connect the remaining probe of your multimeter to battery positive. You should read very little, the less the better, Anything more than .3v or so (3/10 of one volt) you need to address this. One good way is to use the "ign run" feed coming into the engine bay to feed a relay, and use the relay to control the engine bay IGN loads.
