Quick question for you electrical guys: Over the past couple of days, I have noticed something happening here on my 87. While driving, and sometimes just idling, the volt meter will jump around below 12 volts, the headlights (and all interior dash lights, etc) will blink off quickly and then come back on. This isn't constant, but probably happens at least once a minute?? Is this indicative of a wiring short, or should I look at the alternator? It's a relatively new 140 amp Powermaster, so my first thought would be some kind of short. This started developing on the way home from our last 4x4 trip two weekends ago, but has gotten worse.