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<blockquote data-quote="bananapehl777" data-source="post: 8766999" data-attributes="member: 679217">Thank you for that info. I am a bit confused on how I could run that closed loop set up that you mentioned on my car with just two batteries. How would it help my voltage? Car is an 05 Subaru Outback XT (2.5 L 4-Cyl Turbo)Also, UPDATE: This weekend I went through the grounds for both batteries and the engine ground. I cleaned them up and stripped paint to ensure a good connection and verified connection with my multimeter. Measured 00.0 ohms on all of them. (Turns out the original shop that did my big 3 did not upgrade engine ground, so I added 0 AWG for engine ground.) I also went ahead and increased my idle speed to ~950 rpm. Based on the alt specifications and pulley ratio, that gets the alt to about 180 A. Took it for a test drive today, and cranked it to full volume but still saw a minimum of about 12.5 - 12.8 V and headlight/gauge cluster dimming. This feels pretty frustrating given all this equipment for 1700 W, but I&#039;m thinking an overdrive pulley might be the next option. Still,&nbsp; I would think 180 A would be enough for this system power.</blockquote>

[QUOTE="bananapehl777, post: 8766999, member: 679217"] Thank you for that info. I am a bit confused on how I could run that closed loop set up that you mentioned on my car with just two batteries. How would it help my voltage? Car is an 05 Subaru Outback XT (2.5 L 4-Cyl Turbo) Also, UPDATE: This weekend I went through the grounds for both batteries and the engine ground. I cleaned them up and stripped paint to ensure a good connection and verified connection with my multimeter. Measured 00.0 ohms on all of them. (Turns out the original shop that did my big 3 did not upgrade engine ground, so I added 0 AWG for engine ground.) I also went ahead and increased my idle speed to ~950 rpm. Based on the alt specifications and pulley ratio, that gets the alt to about 180 A. Took it for a test drive today, and cranked it to full volume but still saw a minimum of about 12.5 - 12.8 V and headlight/gauge cluster dimming. This feels pretty frustrating given all this equipment for 1700 W, but I'm thinking an overdrive pulley might be the next option. Still, I would think 180 A would be enough for this system power. [/QUOTE]

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