2016 Ford Fusion Hybrid Battery Draining Quickly When Flat-Towing

Question:

Im towing a 2016 Ford Fusion hybrid Another retailer installed the Invisibrake on my car they didnt connect the vacuum line and used aux. brake lights . Everything ok, but now my battery is going dead after about 1 hour of towing the vehicle I have the headlights on in the RV to help charge the battery on the car but the car is completely dead , I have to jump start the car to start it . Do I need a extra charging wire to the battery with a 20 amp fuse or how can I charge it through my plug wiring ? 2005 Fleetwood providence and 2016 Ford Fusion hybrid

asked by: Larry B

Expert Reply:

Per the attached diagram, the InvisiBrake System, part # RM-8700 is attached to the Fusion battery.

I checked the owner's manual for your Fusion and it states that the key should be positioned between the off and the accessory mode. I have attached a drawing with an arrow that indicates where the key should be positioned when towing. If the key is left in the accessory position it will drain the battery.

expert reply by: Jeffrey L