Forum Discussion

jd4010's avatar
jd4010
Explorer
Apr 22, 2016

Generator use while towing

Greetings. Recently purchased a generator that is going to be mounted in the back of my truck to provide power to our 5er. Thought is that we'll run the generator while towing to keep the 2 refrigerators running on AC plus we'll be able to stop along our routes and use the 5er's A/C units.

So my question is this. When running shore power, or in this case the generator, while towing, do I need to disconnect the 12v lead on the 7 pin plug to avoid the 5er from back feeding into the truck (tow vehicle. I know the 7 pin plugs have a 12v lead that does enough to keep the camper battery charged ---- but I don't want the generator to back feed or impact the truck in any way. So my though was to install a switch that would allow me to shut off the 12v lead on the 7 pin when we're using the generator and to switch it back on when not.

Maybe I'm just over complicating things. But wanted to ask for thoughts.

Thanks.

12 Replies

  • On my 5th wheel the generator will charge the batteries on the 5th wheel through the converter/charger and 12V is sent to the truck through the pigtail plugged into the truck. No damaging feedback since the 12V system is isolated from the 110V system in the 5th wheel.

    What you are proposing will work. But you'll need to make sure your power cord is securely attached from the truck to the 5th wheel with slack to allow for turns. I saw a guy towing down the road with his power cord dragging on the ground. It had come loose on a bumpy section of road. Luckily he stopped when I flagged him down befor there was too much damage.
  • RoyB's avatar
    RoyB
    Explorer II
    The fridge in mine stay good for many hours if you don't open the doors...

    Never had a generator big enough to run the A/C's so can't help you there...

    Roy Ken