Alternator Fuse blowing above 3000 RPM

Jules98GT

New Member
Apr 4, 2021
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29
Indiana
Hi all I am new here and look forward to sharing all my adventures lol

I have a 1998 Mustang GT.

I've run into an issue where above 3000 RPM the alternator fuse is blowing. That the 20 amp one in the engine compartment.
I have tried 3 alternators. All with new rectifiers.
I've replaced the fuseable link, and replaced the 3 wire connector at the alternator. yel/wht, grn/red/ blk/wht
I have NOT replaced the blk/wht wire that is apart of the rectifier circuit.

Before i start replacing the wiring in the charging circuit all together I wanted to ask a few questions.

I noticed two connectors under the fuse box, same colors as the rectifier wires. Is this how we get from the blk/org wire to the yel/wht wire?
Where is this change made?

This circuit is stupid simple.

Thanks!
 
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Jules98GT

New Member
Apr 4, 2021
3
0
1
29
Indiana
Update: Replaced charging wire, I also took apart the fuse box to check the terminal connections. The terminal for that fuse is a little loose. I re-seated it and put it back together.
Fresh set of battery cable ends, a new belt tensioner and belt

Started the car reved it up and WOILA all good.
Let the car warm up and reved it again and it popped.

What is going on here?

Ohm readings are as follows.

Battery to Alt - 0 ohm
Yellow/White wire to fuse block - 0 hm
Ground terminal to alternator body - 0 Ohm.

Thanks in advance.