JHZR2
Staff member
Ive been going through wiring in my truck, and found two 12v sources from my battery to a round plug on the rear. One is switched, the other is constant on. The truck has a circular connector, not the four SAE pin connector I’m used to. The truck does have an aftermarket brake controller...
But why a switched 12V? I kind of get if a 12v source was desired, but switched? Is that just best practice for some reason?
It doesn’t much matter, just found it curious. It is an illuminated switch too, fwiw, so I guess there was interest in being reminded that it was hot.
I get it that it could really be from all sorts of things, but is there a common rationale why this would be done? I’m just not familiar with trailer wiring beyond the simple four pin harness.
But why a switched 12V? I kind of get if a 12v source was desired, but switched? Is that just best practice for some reason?
It doesn’t much matter, just found it curious. It is an illuminated switch too, fwiw, so I guess there was interest in being reminded that it was hot.
I get it that it could really be from all sorts of things, but is there a common rationale why this would be done? I’m just not familiar with trailer wiring beyond the simple four pin harness.
