Forum Discussion
mowermech
Aug 24, 2014Explorer
I question the need for a diode.
My old tow vehicle had a continuous-duty relay installed in the trailer charge line, so that the power to the line was shut off when the truck ignition switch was off.
Before that, I just disconnected the umbilical when stopped for any length of time, to prevent the trailer from discharging the truck battery.
But then, I am "old school" enough that if it can be done either mechanically or electronically, I will choose mechanical every time!
It is worthy of note that here in Montana (and many other states) any trailer with electric brakes MUST, by law, have a breakaway system that can activate and hold the trailer brakes for at least 15 minutes. This system requires a battery, which requires a means to keep it charged. Thus, ALL vehicles which will tow a trailer with electric brakes MUST have a charge line to the trailer electrical connector!
My old tow vehicle had a continuous-duty relay installed in the trailer charge line, so that the power to the line was shut off when the truck ignition switch was off.
Before that, I just disconnected the umbilical when stopped for any length of time, to prevent the trailer from discharging the truck battery.
But then, I am "old school" enough that if it can be done either mechanically or electronically, I will choose mechanical every time!
It is worthy of note that here in Montana (and many other states) any trailer with electric brakes MUST, by law, have a breakaway system that can activate and hold the trailer brakes for at least 15 minutes. This system requires a battery, which requires a means to keep it charged. Thus, ALL vehicles which will tow a trailer with electric brakes MUST have a charge line to the trailer electrical connector!
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