towing 2015 Ford Edge

[Tatty]

We just bought a 2015 edge FWD to tow behind our MH. We had an 2011 Edge before with a trickle charge line installed into the coiled wire from the MH to the car. When we got the new car we had a new trickle line put on the car at the + battey terminal. After traveling 200miles when we stoped we had a dead battery. Does anyone know if there is something different about the 2015 Edge? When I get into the car I start it put it in N and turn it off then hit the start button twice to get it into auxiliary power. Am I doing something wrong?

[BFlinn181]

Make sure there is a good ground connection between the RV and the toad. I really doubt the use of a 12 v 'trickle charger.' The so-called trickle charger is just passing the voltage from the RV alternator through to the toad battery. The toad battery should get charged and the battery's internal resistance should limit over charging. Your dead battery points to the fact the voltage isn't getting passed through or is too little to overcome the amperage needs while being towed. I would more likely think there's a bad ground connection. You could test with a meter and a jumper wire from RV ground and toad ground.