charging system help!!

OK, first WHAT kind of alternator / regulator you using, I.E. the 70/ later Mopar, or Delco/ Ford, etc?

Overcharging on (such as) the 70/later Mopar system can be caused be either or BOTH a ground problem or an ignition voltage problem

FIRST, engine OFF, key in RUN, put one probe on your battery positive, the other probe on your IGN terminal supplying the regulator and ignition. What you are measuring here is VOLTAGE DROP from the battery to the regulator. You want to see LESS THAN 1/2 volt, the lower the better, zero would be great.

Next, start the engine, and make these tests with the battery up and normalized, first with all accessories off, and again with heater, lights on

Put one probe directly onto the battery negative post, the other directly onto the regulator case. Make sure you "stab" through the paint, chrome, etc. You are wanting to see a very low reading NOT more than .2 (two TENTHS) of a volt. More means you need to look for ground problems

Now check the hot side. Put one probe directly onto the battery positive post, the other on your IGN/ regulator supply from the key. Once again the lower the better, zero volts would be perfect, and over .2V is too much.

If all this checks out, you may have a battery problem.