Good day! My ride is a 2003 Ford F-150 with 4.6-liter SOHC Triton V-8 and I think I just might have a problem with my alternator auto parts and charging system. My additional accessories include a sound system with 2 10" inch subwoofers and a set of PIAA fog lamps. Electrical system is not charging battery. I tried changing the solenoid, and even got a new battery, but still charging is really weak. Any suggestions?

 

check the belt for tightness, but it sounds as if your alternator is on it way out. and its giving you a warning by charging weakly.

and for the record, i wouldnt classify the subs as a electrical accessory. the amp you hav driving them is whats taking from your battery.