Originally Posted by Walke
Like I said, there are no technical reasons to put it on the ground side just opinons !!
As a retired electrical engineer - who never designed RV electrical
systems - it certainly seems that there is no difference between
opening the "hot" or ground lead.....If, and only if, the switch is
very close to the battery posts.........
If the switch is in the hot lead and is quite a distance from the
battery, you will have a long lead and one (switch) terminal that is
ALWAYS live. This opens the possibility of a "short" to ground.
The ground lead is usually quite short - connecting to the nearest
chassis point - so a switch in the ground lead would likely not
have this situation.
I would call that a "technical" reason...........YMMV.