f is field
e is earth
n is relay control bit, 6v is fine.
unplug 3pin plug, put 12v "+" to "F" and that will bypass reg.
start up, not reving too much, check voltage at batt. should be 13.8v and upwards as you rev it more.
not too much, as the reg has been bypassed. go over 15 volts, you will start blowing bulbs and boiling batterys.
if all good, turn everything electrical on full - wipers, lights on hi-beam, heater, etc.
run above test again, this will load test alt, wiring and belt slippage.
put volt meter between batt "+" and alt"+" under full electrical load, and rev up a bit.
no more than 0.5v
same from batt "-" and alternator body.
report back findings when done.
go.