Just picked up an '84 M1008 for use on my farm. Have had some charging issues (surprise surprise). Was doing fine until a week ago. Charge guage was going lower and lower everyday. Changed out the passenger side generator, no dice. Checked all the connections and cleaned them. No dice. Charged the rear battery up, and its been working fine since them. The Gen 2 light is on, but i have about 26.8 v across the two batteries. (front ones getting approx. 14.3v and the rear is 12.5v) Why would the dash indicator light still be illuminated?