More electrically issuses

[MikeS02]

Hi everyone. So my 02 GT was lossing power while it was running, I replaced my alternator AND battery rechecked all the grounds and the battery light is still on and still drainin power. I’m kinda puzzled as to what it could be does anyone have any ideas? I could really use the help.

 

[wmburns]

There are a number of fuses that IF blown could cause the alternator not to work. Do you have a Volt-Ohm Meter (VOM) and are you willing to use it?

Test for key on power in and out of fuse F1.20 and F2.5. Use a known good ground. Best to also use a test light that "loads" the circuit.

Confirm +12 volts at the alternator B+ terminal. Use a known good ground. This will test the fusible links.

Confirm key on +12 volts at the alternator YE/WH wire. Again, use a known good ground.

1999-2004 MY fuse panel schedule:
https://www.allfordmustangs.com/for...r-swap-wont-fire-please-help.html#post2669271

Howto perform charging system voltage drop test
https://www.stangnet.com/mustang-fo...perform-charging-system-voltage-drop-test.56/