2002 f250 lose all power in the cab but truck runs fine.gauges and system are dead ...anyone

 

alternator would be my best guess

 

had it checked .said it was good batteries too somethings clickn under the dash.400 miles away from my owners manual.could it be a relay under the dash in fuse box???

 

yeah if its not batteries or alternator it is a fuse or relay, i am sure there is a forum on here that has the owners manual in it?

 

dont know where to look at forums??

 

GEM module or relay. Can't remember where the relay is but the GEM module is on the hump at the bottum of the dash.... Seen these get wet and cause this exact problem meaning both the relay nd the module. I always try relay first. wish I could remember location for you....

 

click on this https://www.dieselbombers.com/ford-p...d-manuals.html