QUOTE(goohtj @ Jul 19 2017, 07:01 PM)
get a cigi volt meter. rm20 only.
engine off - voltage = 12 to 12.6 v [battery voltage ]
engine on - voltage = 13.6 to 14.2 v
alternator ok.
k there are some 'interesting' things that can happen if wiring is an issue, just something i experienced
Start car, cold, 14.1v flat, no issues. Drive around for 10 mins voltage suddenly starts to fluctuate to around 10-12.... it goes utterly nuts 'sometimes' so i assumed my alternator died... i lived with this for like a whole month (i had an electric charger so i was relying on that while figuring it out)
As a last and final test resort i pulled the battery when it started to mess with me, i mean nothing to lose right? cabut battery, car remained on, head lights didnt waiver at all... this was very peculiar. Voltage bouncing anywhere from 7 one min then rising back to 14v after... So yeah probably regulator?
So the last test i did was to pull the voltages directly from the alternator itself, a direct source line, once with both ends, once positive once then negative, in the end, it turns out, one bolt was abit greasy and kept getting loose (its got to be suuuper tight)