the trailer pin marked aux will charge a battery on a trailer if both vehicle and trailer are wired correctly
Relay # 302 is the trailer tow battery charge relay in a 2002 Ford Expedition
I don't know anything about towing trailers but the 2007 Ford F-150 owners manual shows : fuse # 106 - 30 amp maxi fuse - for trailer tow battery charge and relay # R05 - Full ISO relay - for trailer tow battery charge
wht type battery do you use
The 1993 Ford Ranger air conditioning charge valve can be found on the top of the air conditioning compressor. The charge valve will be marked as the low pressure valve.
I do not know if this is your problem, but on my 1993, this meant I needed to charge the battery or get a new one. Once I finally bought a new battery, this stopped.
Dead battery Fully charge or replace Dead battery Fully charge or replace Dead battery Fully charge or replace
to make a quick check -- start car - disconnect the positive cable at the battery as it is running - if car stalls the alternator is bad if it stays running the battery is probably too weak to hold a charge. (daddmac)
Bad battery won't take charge Bad battery cables Fuseable link
Your battery isn't being charged or accepting a charge
I've pulled a 20,000lb trailer with my 2001 ford f250, so i cant see why not.
try the battery fuse
the battery will not charge properly