How To: Diagnose Charging and Battery Issues

FC Zach · 03-27-2008, 01:00 AM

It wasn't the alternators the whole time, I didn't have the voltage regulator plug attached. Hell,, I didn't even have the plug since I've cut the harness after converting to carberation. So the new question is, , , Is the color of the wires BW & BrY for my S4. And also since I've already bought a new FD alternator where do these wires go (if these are the correct pair) on the FD alternator? I've read an archive on the other forum (probably shouldn't mention that) that said the Black/White wire goes on the upper plug of the FD alternator, is this true. And last can can someone send me a link to the website that makes the Dual Sheave Conversion Pully for the FD alternator?

FC Zach · 03-27-2008, 01:10 AM

Yeah I know, I'm a needy M'er F'er. The Black/White is a ground that i traced going to the ECU. Well since I no longer have an ECU, can I just ground the wire to the frame? Or is this some kind of switched ground that I need the ECU to control? Any Information would be greatly appreciated.

RETed · 03-27-2008, 02:47 AM

One wire is used as a voltage input for the internal voltage regulator.
I believe the FD needs a constant +12VDC.
This needs to be connected.

The other is for the warning light.
It triggers a signal to the warning light cluster to tell you there is something wrong with the (electrical) charging system.
This doesn't need to be used.

-Ted

03-27-2008, 01:00 AM	#1
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	I'm ashamed!! It wasn't the alternators the whole time, I didn't have the voltage regulator plug attached. Hell,, I didn't even have the plug since I've cut the harness after converting to carberation. So the new question is, , , Is the color of the wires BW & BrY for my S4. And also since I've already bought a new FD alternator where do these wires go (if these are the correct pair) on the FD alternator? I've read an archive on the other forum (probably shouldn't mention that) that said the Black/White wire goes on the upper plug of the FD alternator, is this true. And last can can someone send me a link to the website that makes the Dual Sheave Conversion Pully for the FD alternator?

03-27-2008, 01:10 AM	#2
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	One Last Question Yeah I know, I'm a needy M'er F'er. The Black/White is a ground that i traced going to the ECU. Well since I no longer have an ECU, can I just ground the wire to the frame? Or is this some kind of switched ground that I need the ECU to control? Any Information would be greatly appreciated.