Alt upgrade. Do I need to add a wire going from the ALT to the battery positive? - Subaru WRX Forum
 
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#1 Old 03-05-2013, 06:47 AM
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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.
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#2 Old 03-05-2013, 05:47 PM
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Not sure, but if you don't hear good answers from any of us soon, ask on a stereo forum, I'm sure someone on one of those will throw you an answer quick.
Sorry

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#3 Old 03-05-2013, 07:30 PM
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Alt upgrade. Do I need to add a wire going from the ALT to the battery positive?

Anybody know what size fuse the 06 sti uses? If he's just upgraded the alternator to a sti spec one. Wouldnt yhe sti fuse be what he needs? I my self had had many stereo systems. Last 1 being 2 alpine type x 12's in big ported box and a hifonics 2000rms st 1 ohm which is what they were wired to but I also had a capacitor you might want to look into one of these. It acts as a second battery almost. Shows the charge it is at and the amp draw if you get one that has 2 displays. Wires in between the amp power wire and the battery. Check out some capacitors don't buy cheap ones. ### you'll get what you paid for hope this helps.


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#4 Old 03-05-2013, 07:38 PM
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Alt upgrade. Do I need to add a wire going from the ALT to the battery positive?

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here's the capacitor I had with mine. It performed amazing never had a problem and I was pushing close to 4000 watts at 1 ohm.


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#5 Old 03-10-2013, 07:54 PM
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I added some grounds and a 100 amp fused bypass for the new alternator, that I put in.
I will be getting some loom for the grounds, so every thing's not red.

The Scosche wiring kit that I got came with a .5 farad Cap so I put it in.

I'm not really sure if it's doing any thing, but the sub is hitting hard enough that I'm going to have to take the headliner out when its nice out and put some foam on the inside of the roof so it doesn't vibrate.
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