Quote Originally Posted by Blitz View Post
From another forum, on Yachts, in relation to using a 12 volt system off of a 24 volt charging system, and ""Sharing a Ground"" ( DC Voltage , 12 and 24 volt )

Quote:

In theory, yes, all "ground" busses would be tied together.

But in practice, this creates a new hazard on the boat. By tying the 12 and 24 volt grounds together, you now create the hazard that you can have a short or other unintentional connection between the 12 V+ and 24V+ systems, putting 24V on the 12V system or creating a 12V loop in the 24V side.

That might be a small hazard and worth ignoring in favor of having one common ground--but I'd check out the system with that thought in mind, and make doubly sure the two system positives were kept isolated from each other to make sure it couldn't happen.

End Quote.
I don't really see this as being a problem.

If two positives "short" together on any system single or dual voltage, it is a problem.

I agree it may be a bigger problem in a dual voltage system.

Having any positive connecting to another positive seems unlikely to me. If all the wiring was installed properly to begin with and is not damaged somehow I don't see this as an issue.