scott matre

My 87 is giving me some weird symptoms lately that I could use help with. I notice that the headlights, fans, etc go from dim to bright and vice versa occasionally. Suspecting faulty charging, I checked voltage in various states at the battery
1) car off, no load 12.9 v
2) car idling, no load 12.3 volts
3) car at 2500-3000 rpm 13.5, then intermittantly 14.5 volts.
The transition from 13.5 to 14.5 volts occurs abruptly rather than gradually.

Confusion has set in because the book says that you should have between 13.5 and 14.5 volts at 2500.

Also, never had a dead/weak battery.

So my question.... bat voltage reg, alternator, battery, or loose/bad wiring.


Thanks,

Scott