My volt meter was reading +13 v. until today when it dropped to 10-10.5v. I operated my power windows and the v-meter nose dived until I took my finger off the button. The battery was old so I changed it as a first step but this made no difference on start up, still 10-10.5v. This is an 88 5.0 motor. Is the alternator shot? By the time I got home and shut off the motor, I tried to start it and the battery was run down to far.
Alternator time!
Since your gonna have to buy a new one anyways,Go with the 130amp 3g it's 100 times better than the 65amp 2g you have in there now and is very easy to install,hour and half tops.
to me it sounds like your alt ed out on ya. what are you running on the car becides what came with the car? amp? anything that is gonna take alot of juce to use? because if you are that will kill a new alt quickly! but also is it the origional alt?