Battery Keeps Dying on Tow Car

rv4jimnme wrote:
First time we have experienced the tow car not starting. We frayed the electric connection cord (the one that runs from coach the towed car), since we did not know it was dragging on the ground. So thinking this was the problem we bought a new one and the problem went away for about 3 weeks of travel. Yesterday, however we arrived at our campsite and the Honda CRV would not start, so had to call Good Sam for a jump start. We had the battery in the Honda tested and all connections everything checked out fine, that was about 3 weeks ago on the first episode. Everything is turned off in the Honda i.e. no fans etc. We also do not tow with the alarm on. Upon starting the car this AM I noticed that the Alarm bleep, the sound it makes when you unlock the car, is noticeably "weak sounding" not as loud as it always is. Just an off the wall observation.
As a side note: At first we felt maybe, this was in some way connected to the fact that we convert our power on the road to run a computer, we always use the house battery plug in for this. However, the GPS I have been plugging into the engine battery (cig lighter) thing. Could this have anything to do with draining the tow car battery? Thanks for any help or advice.