Re: Alternator/battery Problem!
If the battery keeps going dead, and your charging voltage at the battery when running is 13.5 - 14.6 volts, then the next thing to check is Ignition Off Draw. Something is staying on somehow and drawing on the battery. Using the Amps or A setting on your multimeter, start by having the windows wide open, so you can slip into the car without opening the doors, since this will turn the dome lights on and increase the amp reading. Now, loosen the negative battery cable clamp, clip the positive lead of the multimeter to the negative cable clamp. Now, while sliding the negative cable clamp off of the negative battery post, clamp the negative lead of the multimeter to the negative battery post. Fully remove the negative cable clamp from the negative post.
Let the car sit for 10-15 minutes, then check the multimeter amp reading. You should have no more than 0.035 A. Any more indicates something is staying on. There can be OBDII monitors for the engine management that stay on for a bit, then shut off when complete. So after a half hour to 45 minutes, recheck the reading. If it's still high, start by checking that no interior lights are staying on. Next, have a wiring diagram for the car handy, and start gradually removing fuses until the draw is gone. Find the fuse that eliminates the draw, then using the wiring diagram find out what it feeds (provides power for). Then you would re-install the fuse, and disconnect each component until the draw eliminates.
Master ASE Certified L1 Chrysler Technician- still a Ford fan at heart.
1964 Thunderbird Hardtop- Chantily Beige- 390 FE 4V V8-Uncle's Car
1966 Thunderbird Convertible- Red- 390 FE 4V V8- Uncle's other car- waiting for paint and body work!!!