12v charge line fuse blown from tow vehicle
the few times I have checked the 30 amp fuse that protects the 12 volt charge line running from the tow vehicle to the trailer, it has always been blown. So it makes me wonder why that’s happening. M...
Forum Discussion
My money is on a short somewhere, or a problem with the trailer's battery. The truck "charge" line is sort of intrinsically protected against heavy loads by being a fairly small wire, incapable of carrying much current. If you try to actually draw 30 amps over the wire, the voltage would drop below what the trailer battery is resting at, and current starts flowing from the trailer battery instead, or balances out.
But for example, if there's a poor connection between the charge line and the trailer battery, or something wrong with the trailer battery (dead), then yes you could blow the fuse on the truck side, since the trailer battery won't pick up any slack as the voltage drops and current rises.
I often run heavy loads while connected to my truck. I usually run the jacks down with the truck connected and engine running, as the jack runs faster with the engine running. I've run the microwave and sometimes a toaster off inverter while the truck has been connected while Wallydocking or otherwise parked in a rest area.
But for example, if there's a poor connection between the charge line and the trailer battery, or something wrong with the trailer battery (dead), then yes you could blow the fuse on the truck side, since the trailer battery won't pick up any slack as the voltage drops and current rises.
I often run heavy loads while connected to my truck. I usually run the jacks down with the truck connected and engine running, as the jack runs faster with the engine running. I've run the microwave and sometimes a toaster off inverter while the truck has been connected while Wallydocking or otherwise parked in a rest area.
