Join Date: Aug 2016
Location: Potomac Falls Virginia
Car: 2005 Outback Wagon 3.0 L.L. Bean
Feedback Score: 0 reviews
I have the same alternator. I have a "boomin system" which draws amps more than you're trying, (but not by a lot). I have no issues.
My current system was in my old Legacy. I had problems on that car. I already used proper gauge power/grounds for the amps. I threw in a 200A alternator and any change was barely noticeable. Shortly after I did the big 3 upgrade and that solved all my problems.
I did the big 3 upgrade on my current 05 when I transferred my system from old legacy. (The fancy alternator would not work in my H6). I was so happy when I had no dimming on this with just the stock alternator and some welders cable. It took me a long time to learn the importance of that simple mod.
+ALT---+BAT (supposed to be fused)
-BAT---SOLID GROUND (existing strut tower lug/bolt)
SAME SOLID GROUND---ENGINE BLOCK
There is no need to remove anything factory. These 3 cables more or less piggy back the same route.
If you still have issues or, it's better but not completely gone, then look at the ALT GROUND. My old Legacy needed a 4th cable because the pivot area wasn't conducting well. My 05 doesn't need the 4th cable.
ENGINE BLOCK---ALT BRACKET
Try it before capacitors or fancy alternators. You'll need about 6' of 1/0 gauge, (max that fits ALT), welders cable and lugs. Be picky with the lugs. Look at the bolt holes where they are going first and get right hole size to maximize contact.
RIP 96 Legacy 2.2 Thanks for 380,000 miles. (4EAT lost reverse)