I am sure this is not news to a lot of you but if you are towing with an f-150 check to see that you have the relay and fuse installed for charging your camper battery. I came across this info in an...
We had the exact same thing come up just a few weeks ago....we've had the F-150 since '03!!! DH was going nuts trying to figure out what the problem was and envisioned all sorts of dreadful things. Can't remember who it was that mentioned it - maybe the Auto Zone guy - but he swapped one from another location and Bingo!....just a few dollars and we were much happier. Now, why did Ford install the factory tow package and neglect this little matter???