alternator not charging the system, which wires do i replace.

[deazndude]

So first off, I tested the car with the engine running and it was not charging. So next on my voltmeter, I ran one lead from battery positive to the B terminal of the alternator( where the orange and black wire run to). That read around 5 volts which according to my google-fu means that there is too much Resistance. So I wanted to know how the wiring is ran to the batery so I know which one to replace.

 

[hvyman]

whats the red wire for?

 

[deazndude]

I'm not sure I believe it's the charging wire, it also has a 30 amp fusible link on it also.

 

[hvyman]

looks like maybe fuel pump. looks janky tho.

whats that other red wire? is it hot?

 

[deazndude]

It was just there, and bouncing around. I just zip tied it to something. I don't think it does anything. It runs into the harness, then the harness splits, one going to the passenger fender area, and one going past the radiator back to the fuse box area.

 

[hvyman]

Then somewhere between the alternator and the battery you are losing 5 volts. That black wire goes from the alternator to the fuse box to the alt fuse to the the battery.

You can do the same voltage drop test from the alternator to where that black wire meets the orignal wiring some where near the fuse box.

 

[deazndude]

I measured from right below the fuse box under the 100A Alternator fuse right on that bolt with the black wire and it shows a 0.03. Can i measure it from there?


EDIT: Actually I see what you're saying let me start digging around.

 

[hvyman]

Try from there to the alt and there to the battery. If its half a volt then your fine and its most likely the alternator.

 

[deazndude]

Fuse bolt to battery showed 0:03 again, while Fuse bolt to Alternator showed 4.46ish. So it's definitely somewhere along that black wire correct? I'm going to pick up some new ring connectors and battery terminals if that's the case.

 

[hvyman]

Yeah.

That wire does not appear to be stock with the electrical tape around it right there.

You can make a whole new wire pretty easily with some 2-4 gauge wire. Prolly the best way to go about it.

 

[deazndude]

www.youtube.com/embed/11sp6PSefiI

 

[hvyman]

I dont get??

 

[deazndude]

Sorry I thought i edited this post to fix it guess it didn't go through.

The black wire running from the Alternator actually went just straight to the Battery positive Terminal, I noticed it once i took the battery out. I replaced that wire and now it's showing 14.6ish volts across the battery. So everything is looking good. I just wanted to thank you for all the help, I really do appreciate it.

The Video: It started this strange whistling about a week ago and I'm not sure exactly what's wrong, was wondering if you had any ideas.

 

[hvyman]

Hard to hear. But get a stethescope and check the pulleys.