6V and 12V Circuit Question

Posted by Bob J On 2023/11/27 15:50:03

As most of you, my car is 6V.
That said, I have an accessory that is only available in 12V.
My thought is to have a separate 12V battery hooked up to this accessory, as it is a low power draw, I will simply charge the battery at a time the amperage drops too low.
My question is this:
Can I run a hot lead to the accessory and simply ground the positive to the frame like the 6V does? (This is fine with the accessory, it is positive ground)
As they are two separate circuits I expect they could both use the same ground. I can run a ground wire as well to the accessory, but I am trying to see if I can drop the redundant ground wire run.
Thanks,
Bob J.