on top of the alt there is the the terminal with a black wire coming from it, that wire goes to the red box and appears to be hidden below but it just loops up. The other black wire on the front of the alt housing is the ground strap that goes to the firewall. that silver wire from the red box either goes to the pos on the battery or is his power wire for his amp.
but i dont get how that would help the dimming issue any from this setup... running the clear wire from (+) straight to alt makes alot more sense to me...