Hey all! I'm running a fully split two battery setup with a lithium secondary, and I'm looking for an accessory switched underhood fuses. They all seem to be either constant on or ignition switched. I want my Auxbeam panel on accessory switch so I can run them and the car on the isolated camp battery but not be able to forget anything on when I walk away or go to sleep for the night. Secondary will be solar maintained and switched with starter AGM via a 250A 12VDC five pin relay, switching the starter battery in when the key is in ignition ON. In ACC and off, the lithium camp battery is cut in and the starter out. AGM is on NO leg and LiPo camp is on NC. I don't want to have to power all the "the car is running" stuff when all I want are some camp lights and maybe the radio.
Underhood ACCESORY fuse (2 Viewers)
- Thread starter RFINIAN
- Start date
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Reading along and learning 
happy to see more info.
happy to see more info.
- Thread starter
- #3
At the worst, I'll sit down with a test light and a buddy and map out all the fuses.Reading along and learning
happy to see more info.
Why not run a fused lead off the battery to a relay and switch?
- Thread starter
- #5
I don't want to forget the switch and run the car off the lithium for who knows how long until I remember, or set up camp and run the AGM start battery down until it starts eating itself. This setup keeps both batteries fully isolated from each other at all times because different chemistries don't play nice with charging/discharging on the same circuit, and the lithium has over current shutoff and I don't want to trip it work the starter. Auto swapping batteries keeps both happy for as long as possible.
