Re: Remote Kill Switches

Posted by Fish'n Jim On 2023/10/15 9:28:37

switches are more rated on amperage than voltage. However, lots of junk coming from offshore, caveat emptor. Much like wire size, there has to sufficient contact area for current to pass without heating. It not just at shutoff, but how it works when turned on. Voltage only affects the insulation, per se. Compare to hydraulic flow. Current is the volume(area dependent), Voltage is the pressure(containment dependent).
It's typical in 12VDC- to put the switch on the neg as it prevents sparking when reconnected. I'm not sure either is appropriate for + ground. I haven't studied that one. Make sure the instructions specify and not just the same as 12. Could be shocking experience.
I tend to use AMG so they aren't as predisposed to drain cycling failure. I can forget to disconnect the switch, too. Charge it before I use.
Positive grounds will leak off continually as it also plays an anodic protection role, preventing corrosion. Negative ground only passes through the body when flow required. It's one of the inherent issues with 6VDC +, the other is it requires twice the amperage/larger wires/contactors which drains wet cells faster. The old generators/VRs were only 30-35A rated, so if you didn't run it long enough, the battery never gets fully charged. Typical 12s today are 45-60A or more.
Those charge/discharge wheatstone bridge ammeters don't tell you much about battery condition. Just the difference in technical understanding of the times.
If you want original you have to put up with original.