Also posted on Planet Isuzu...

Brake light and battery light come on after starting the car (1995.5 Rodeo S, 3.2L V6, 4x4 with manual tranny).

The lights clear immediatly after reving the motor above 2K rpm and don't come back on while driving at all. The volts seem to be in the normal range too. Haven't really paid attention to it that much though.

I think this started after going to the car wash. What I first noted was that the AC blower fan wouldn't come on right away after starting (the battery light didn't stay on. Now the other night the brake and battery light stayed on after starting and instantly turned off after reving the motor up.

Anyone seen this before? Possible loose or corroded wires on the alternator maybe? The last time my alternator went out, about 2 years ago, it just died suddenly with no warning at all as I was towing my tent trailer home from a camping trip. Limped back into town running on the power in the batteries (my tent trailer battery is wired to charge when the trailer lights are plugged in). I immediatly killed all hights, stereo, fan blower, etc and one by one another dash warning light would come on as the batteries lost juice.

Anyway, I had my trusted local independent mechanic replace the alternator last time, and I seem to recall he had an issue with finding the correct replacement... 3 wires versus 4 or square plug versus round or something like that. Online parts vendors seem to show two different Hitatchi alternators also.

I'm hoping that it is just a corroded contact... but my luck its internal to the alternator / voltage regulator...