Alternator question, battery is discharging quickly.

[FC Zach]

Originally Posted by TitaniumTT

I will do my best to remember to check it. If you don't have a text from me by 8pm tomorrow night, text me. It means I've forgotten

Alright, will do.

Originally Posted by TitaniumTT

I would do it the way I posted about for testing purposes only. Once it's confirmed that the wiring is good, and the alt passes it's bench test, you've run it and it charges properly, there's no electrical whine, there's no current draw on the battery and you can leave it for a few days/week with no ill effects, than I would start looking for the factory wires.

Alright, currently have one wire (S Terminal) temporarily ran to the battery. "L Terminal" pending till I find the proper resistor and a switched 12v source.

Originally Posted by TitaniumTT

However, if you're using the factory wires that you find in the harness, a few things are going to need to change in the car itself.
First, the Alt relay that controls the idiot light needs to be addressed. The B/W wire on the S4 chassis needs to be connected to constant power. Both of which are easy enough

Noted. .

Originally Posted by TitaniumTT

That's fucked up. What's the connector originally for?

No idea, I'll share a picture of it later.

Originally Posted by TitaniumTT

It would be the easiest, but I would not suggest going about it that way only because of the potential problems it could cause down the road.

Ten four

Originally Posted by TitaniumTT

Factory it's the FE-03 connector that's on the front harness that houses the wires for the alt. Page 50-16 in the S4 FSM I would find that connector, find the B/W wire and see if that has voltage, if it does, there's your L circuit (originally R) Then it's a matter of finding on the same connector W/G wire and ohming it back to the idiot lights. If you find that connector you can then tap that into anything on the dash harness (stereo) that has constant power. This is the new S terminal on the S6 alt. That would do it as well.

I'll look into this