Originally Posted by behemoth
Well my alt is right side where do ground to motor? Also should there be a fuse from alt to battery if so what size
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Oh I guess I just figured you had a 05-09 Mustang like me :O my bad haha
The alternator is very easy to do on the 99-04 mustangs. It's a straight shot to the battery. The ground to chassis, also easy. Just ground the the frame right next to the battery box (make sure to sand the paint down to bare metal though)
To find the motor ground you can actually just follow the wire from the negative battery post down to the bottom of the motor. That's where your motor is grounded too. It's a little tricky to reach, so a good extention will be in order to reach that bolt. 6" should be plenty.
The positive wire from alt to battery doesn't need to be fused as you want all the electricity going from alt to battery as possible. The more the better
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