Vehicle Battery Lost Power with Trailer Hooked to 2009 Jeep Liberty Overnight  

I have the Prodigy P2 Brake Controller mounted on my 2009 Jeep Liberty Sport which I purchased from Etrailer. Actually Its the second one from you. The first one never really worked right and finally I purchased another and its worked perfectly. On a recent outing I was towing my Casita and stopped overnight at a park for just one night. Since I planned to leave early the next morning I left the Casita attached to the Jeep. I didnt disconnect the power plug since the aux 12 vdc from the Jeep to the trailer is isolated via a relay. The next morning I discovered my Jeep battery was down to just 6 vdc at the battery terminals. Since it was the original battery I assumed it had just died. I got a jump and drove to the nearest Jeep dealer and had the battery replaced. Their test showed the battery was still good but down to about 50 capacity. I kept trying to figure out what could have caused the battery to be drained down so low. I now believe it was the brake controller. I know it will shut down when not connected to my trailer but I suspect it stays energized while connected to the trailer even though the ignition is turned off. Now, my question. I would like to know what the current drain is when connected to the trailer without the brake activated. I cannot find this information anywhere in the documentatioin. I can break into the circuit and measure the current but if you can supply the info it would save me doing that. It would help me to decide if that was what ran the battery down or if there is still a problem elsewhere waiting to flare up again. Thank You in advance for any insight you can provide.

asked by: James P