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Adding 2nd battery. Help wiring

3.1K views 3 replies 2 participants last post by  Fxnteeth  
#1 ·
Ok guys, I have the stock battery and purchased two odyssey 925 batteries. I have a blue sea fuse block coming, and the true isolator. Need suggestions on where to mount the fuse block. Also have 100 amp circuit breaker coming. Need suggestions on how to wire these with accessories. I want everything key hot except for my stereo and amplifiers. Also confused on what to do with the harness going to the bus bar. Do I need to separate it somehow.? 2019 turbo xP. Thx
 
#3 ·
Most people avoid replying to threads like this because it often becomes a very long drawn out thread and time consuming, just FYI.

Two 925's? A 1200 is the common replacement for the stock battery, with a 925 as the second battery. Two 925's will still work, just might be tricky to secure the 925 in the original location ( or not...never tried it)

Under the dash on the crossbar is a pretty common spot to mount the fuse block, or under the hood, but it's better protected under the dash. There are some pre fabbed mounts available that look pretty clean, but it's not hard to build your own or mount it without one.

Wire everything you want to be key powered off the isolated battery, and then everything you want battery powered off the primary battery. The harness to the bus bar should stay on the primary battery unless you want to lose the B+ post at the bar. Put the circuit breaker near the battery in line with the main power feed to your fuse block. You'll have to run two power wires to your fuse block (one key, one B+) if you intend to run both key hot accessories and B+ accessories off the same fuse block, both should have either a circuit breaker or fuse near the battery (or the bus bar B+ post if you get your battery feed from there.

There about 10 different ways to go about it, you could use a relay to supply power to your fuse block, could mount the fuse block by the battery..etc etc..you can really do anything you want, and numerous ways can be considered correct. But your electrical knowledge, capabilities, and supplies are often the determining factor.

Here's a couple threads along the same lines: