I think I understand that the wiring harness connection to the alternator only impacts the Alternator below 3000rpm.
My question is if the plug is unplugged will the alternator still charge, but only when above 3000rpm?

Reason I'm asking is the plug doesn't really "snap" into the alternator and I'm thinking it might not be making a solid connection, at least not all of the time.

thanks for any insights

 

they never really snapped in, they always have a bit of a loose feel to them. so long as it is not corroded at either end i wouldn't worry about it.

the alternator will self excite above 3k so yes, it will still work even if the connection at the 2 prong plug is bad.

 

Thanks!

 

Anyone know where to get one of these plugs?

 

Part # C1900 Hitachi, Mando, and Mitsubishi Alternator Repair Plug, Female. Alternator Wiring Harness Repair Connector with 2 Female Terminals

you're welcome

 

wow, thank you!

 

fairly sure the series 5 FC has the same alternator plug as well, if you see any at the wreckers. i have not physically tried to see if they interchange though.

edit: just checked with some spare plugs i had and they do fit between series 5 and FD.

 

i believe it is also the same plug as the miata, and the pontiac GTO.

 

 

Will a loose connection cause your lights to dim also? Say at idle your lights are dim then when you accelerate it brightens up until you slow down again.

 

that could be a bad alternator or more commonly a corroded or loose contact on the charge post on the back of the alternator to charge wire.

 

With the alternator harness plug unplugged, still seeing 14+ volts at idle.
I thought that the alternator Only self energized above 3000 rpm. Just curious if something
is wrong.

thanks