I am thinking of using a Powermaster d3100 as an extra battery just for the 3k. i can't really change out the alternator as the truck is under warranty and I don't want to tamper with it and void the warranty. It's in an 05 F-150. All wiring is 0 guage.

Here's what I need to know:

I know that the amp-hour measurement is the most important, as anything above 120 or so is the bare minimum this amp needs. Also, how do I go about setting this up with the D3100 and the stock battery w/out cooking my alternator? I haven't done much with multi-battery setups so I want to make sure this is done right.

OR, how would I set this up where the truck runs on 12V and the system on 16V?

This is different from past setups that I built. I used to sell Batcap 8400's and was a Zapco retailer for several years. I'm now on a budget so the Batcap is out of the question so this is kind of new to me. Thanks for your help on this.

Edited February 12, 200916 yr by mdexxxiv

Disregard topic. Found a batcap 8400 on ebay, this will do everything I need it to.