Verify Second Battery Wiring Diagram

Jonnyswboy Recruit
Jun 28, 2019
Noob here just looking to have somebody check over my wiring diagram for my trunk battery. Also, is the only purpose of a battery isolator to prevent the trunk battery from charging the front battery? If that is the case than I don't think I really need one. Thanks!

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Acoustics Engineer
Premium Member
5,000+ posts
10+ year member
May 1, 2007
Quad Cities, IL
Yep, your diagram looks good.

The point of a battery isolator is to prevent draining your starting battery if you play music with the car off for extended periods of time. The challenge with a battery isolator is if you parallel two batteries at different voltages, the stronger one charges the weaker one much quicker than desired, shortening battery life.


Senior VIP Member
10+ year member
Oct 25, 2009
Southern IL
If he had a short with only one fuse, it would blow, but leave the other battery without the fuse to continue to short out............

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