charging problem

The main causes of wrong (high) voltage is

Voltage drop either in ground or ignition harness

Sometimes, a battery starting to go bad

Very rarely, but can happen, a regulator out of cal

Make sure (I'm not kidding) your meter is accurate

To check voltage drop turn the key to run but with engine not running

Put one probe directly onto battery positive post. Put the other probe as "close as you can" tot he regulator IGN terminal. This might be the "high" (ignition switch) side of the ballast, or the blue field wire on the alternator.

You are hoping for a very low voltage, the lower the better. More than about .2-.3V (three tenths of one volt is too much

Now check the ground circuit. Make this test with engine running fast, first with all accessories off, and agin when on. Stab one probe onto the battery NEG post, the other onto the ground mounting flange of the regulator. Same a s above, you are wanting to see a very low reading.

Check your "running" charging voltage WITH THE ENGINE WARM. Regulators have temp. compensation designed into them.

14.5 is borderline high. You don't want above that nor below 13.5

Optimum warm is 13.8--14.2