I can't find a reference to a fault code reading I'm getting on channel 1. It displays a "9." I drive an 89 200T. Also, the volts shown on channel 11 fluctuate from 12.1 to 13.6 as I'm driving. No changes to the load put on the alternator. Is this normal or should I get a new voltage regulator? tia, Scott 89 200T, 188k mi 85 5ks, gone 79 5ks, gone