circuit breaker

So i'm not auto electrician but like many others i wanted a 2nd battery, 12v setup but couldn't afford an auto electricians services. I learnt, consulted a 12v expert and eventually built one myself. It's been in and working for over a year now with no problems at all, but with the cold weather...

I’m running a dual battery setup with my aux battery (120ah agm) behind the back seat in the cabin. 6b&s cable from the starter battery to a projecta idc25 which is positioned next to the aux battery, earthed on the bolt that secures the seat (I’ve removed the back seats for extra room and am...