I noticed my truck didnt want to start like it had a weak battery. I drove it anyway and first my abs light came on, then I started losing all my accessories like radio power windows, etc. I got towed home after truck quit running. I charged the batteries up last night, truck runs but still no gauges, glow plug light doesnt work, radio doesnt work, and I still have not changed the alternator. I took it to auto zone and had it checked they said it was not charging my batteries, but if I do change that will everything work then. I thought if I charged the batteries everything would start working. PLease help.....

All of you accessories can't run from the battery. The alternator has to produce 13-14 volts to you battery to keep the battery charged fully so all the accessories will work. Soon as a power source is powered on it will drain the battery quickly if the alternator isn't putting out. I would change the alternator. Honestly, If you have a shop close by that rebuilds alternators, this is the way I would go. Here in my home town, a rebuilt is $95 as a rebuilt from auto zone is $140-170 and comes with the same warranty. I use a rebuild shop for all alternators and starters. Cheaper and have never had to take one back compared to auto stores.