Guy I’m wiring up a bunch of led lights in my truck and i was wondering if i can grab the power from the drivers side battery? Actually i think a better question is what battery is better to have all of my accessories connected to?

 

No matter what you do put a fuse on it and get the harness grounded in a good location.

 

I actually built a power and relay box that will be fused and will have a inline breaker as well. I’m just wondering which battery is better to pull from and why. Here is the relay board

 

I am assuming this is a diesel as you did not tell us what you are working on. If so, it doesn't matter as both batteries are hooked to together in parallel.

 

Perfect thank you
and yes it is a diesel probably should have stated that

 

it does not matter as they are both tied together, So it draws from both and are charged the same

 

Thanks Brad. I wasn’t sure if the motor pulled off one battery before another.