Battery Isolator For TT. Yes or No?
Sorry for a stupid question if this has been done to death, but I've been thinking that I should install a battery isolator to keep my truck battery and trailer battery separate. When I started doing...
Forum Discussion
YC 1 wrote:
I think you must first prove they are isolated or not.
With thing connected start the truck. Measure the voltage on the TT batteries and the truck batteries. They will be a bit different so write them down. Shut the truck off and take the measurement again. Then go inside and turn every light on you can find, even turn the heater on if possible so you have a large DC load.
Now measure the voltages on each battery bank. Write it down. You will see your TT battery voltage sink and if your truck is not already isolated with the ignition off you should see that battery voltage going down a bit too. If it holds steady you have isolation.
That said, I too just unplugged my truck at night when I had a TT. Worked great. For a bit of a quicker picker upper I would face the truck to the TT and use automotive jumper cables to give the TT batteries a bit of a charge before retiring. This would warm the batteries too helping them in cold weather.
I'm pretty sure they aren't isolated, because the terminal on the 7 pin connector is hot regardless of whether the key is on or off.
