Alt upgrade. Do I need to add a wire going from the ALT to the battery positive?
I'm upgrading from a 75amp (PN: 23700-AA430) alternator to a 110amp (PN: 23700-AA570) alternator.
Do I need to add a fused link from the alternator to the battery. so I don't blow the 80 amp main fuse? And if so what gauge wire and amp fuse do I need?
Car: 2005 Subaru Impreza WRX
Back story: I added a 400RMS sub and amp to my car and started to experience my lights dimming. I upgraded my battery to a DieHard Platinum and that took care of the light dim but not permanently. After 20-30 minutes of playing the stereo loud the lights will start to dim again. I went by o'reilly auto parts and had them test the alternator/amperage at the battery with stereo off, then with the stereo on. Stereo off it had 38 amps at the battery stereo on at 50% volume playing some Sublime it dropped to 13 amps and their machine said low output. The oem WRX 75amp (PN: 23700-AA430) alternator is not cutting it. So I ordered a 06 STI 110amp (PN: 23700-AA570) alternator that I found on eBay.
Thanks for looking, reading, and leaving your thoughts.