"GEN" light on, car off - problem solved
Hey folks, did a search on the above problem, and many suggestions were put forth. This problem is new, but the car has been back together for almost 10 years, with no issues. Ran it around the block the other day, parked it back in the garage, and the GEN light stayed on. ??? Started the car, light off, shut the car off, light on...full color! So popped the hood, and pulled the battery cable, and heard the regulator click. Cable back on, light off. Started the car, then off, light goes on. Pulled the cable, "click", and light off even with cable back on. I suspect leaky diodes. Did a test according to the 1969 GM Service Manual, and the diode test failed. Bought a new/reman alternator, and bingo, away we go. I suspect the old unit would charge, but then leak current through the diodes.
Long story short, GEN light on when car off....do the diode check. Happy 4th, and a salute to our veterans and First Responders!
69 Z-28-Glacier Blue, X-77