Need advice on charging system
Friday I was cleaning my wife'* 2000 Mountaineer and stupid me left the key in the on position when I was cleaning the windows. Realized it seven hours and a dead battery later. I went to jump it in the morning and as soon as I put the key in the ignition I was met with loud honking like the security button was pushed on the key fob. I took off the jumper cables and redid it per the directions on the manual. Got it started once, but it died when I took off the cable. So I just bought a new battery since it was the original. Started fine, but then it was charging low and the battery light was one. Got out the volt meter and it was running around 12 volts, around 12.25-12.5 with the engine off. I was getting pretty much nothing at the terminal of the alternator. I ended up popping the weld nut on the negative cable so I had to replace that cable. Still no change. I've had no luck finding any fusible links. And I found a post on another site with things to try and one was to check the voltage of the fuses in the distribution box. They all measured the same as the battery except the alternator fuse and another fuse for the EGR and some other stuff. They were both near zero. They didn't look blown, but could they be bad?
I did take the truck to Advance on Sunday and they said the alternator is bad only producing 28 amps. The guy said the alternator should be fine for a little while, and the truck did run fine. I also drove it about 10 miles Monday night with the lights and AC on and no problems other than the battery light. But then I went to drive it to work this morning, and a mile from home the ABS light came on, and then it started accelerating badly. I turned around and noticed the tach wasn't registering anything other than jumping when I switched the lights off.
I'm hoping a new altnerator is the problem, but something is just telling me it'* something else. Anyone have any other advice? I'm not electrical savvy, just to warn you.
2003 Black SLE-Stock
2000 Mercury Mountaineer
1968 Oldsmobile Cutlass Convertible-455 cubic inches of muscle