I have a 2004 3/4 ton nothing done to it bone stock. The left headlight went out i thought it was the light,it was'nt. then the batterys start to drain and the windshield wipers stop working. please help not sure where to start.

 

sounds like fcm gone bad for the headlight, as for the wipers that is not controlled by computer so it may be just coincidence

 

Where is the fcm located

 

it is the silver box on the side of the fuse box under the hood

 

cool thanks i will change it