Rivolva wrote:
I'm trying to figure out where the source of the problem may lie, any ideas? Could the battery on the trailer be an issue? Could the wiring harness on the F150 be at fault? Is there an issue with newer F150s being able to handle charging devices as well as the trailer?
It could be a dozen different thing. Stop making wild guess and buy a
current clamp !
With no trailer attached, start the engine and place the meter on either the positive or negative battery lead.
(It may take 5+ minutes for the reading to stabilize, so be patient !)Record the reading.
Remove the meter, shut the engine off and connect the trailer. Start the engine and place the meter on the same wire. After waiting for things to stabilize, you should be getting almost the same meter.
Get out your owners manual and find the page that lists the fuses. Remove any fuse that is associated with the trailer, one at a time, checking the meter each time for a change.