lonnwood wrote:

During the last 2 ground test runs my voltage has been
creeping lower. It started out at 14.2 volts but now it is
around 13.5.  It is from an 87 RX7.
What are the failure modes on these?
Do I just need to change the internal regulator or is there
any testing I can do first?
Lonnie

        Lonnie,

          I ran into a similar situation with my 88 RX7. Battery voltage would
 gradually go low. I was convinced the alternator was the culprit(130,000 miles)
 so I had it rebuilt. After installation I had the same result. I would charge
 the battery but after a day or two of driving to the airport the voltage would
 gradually go low. I finally did what I should have done in the first place. I
 had the battery load tested which showed a bad cell. Apparently the alternator
 could not charge through it. New battery(less than 1 year old,Free replacement)
 and all works as it should. FWIW

      Kelly Troyer

 
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