87merz:

Further on what James Dean had to say above:

The charge indicator light is in the circuit which appears at the alternator as the small blue wire. That circuit supplies an exciting current that is independent of the regulator current. First test: when the key is turned to ON, does the charge indicator light come on? If yes, OK. If no, the bulb may be burned out, and if the bulb is burned out there will not be an exciting current to the alternator. Second test: if the bulb does come on, remove the blue wire at the alternator, and check for +12V at that wire with the key on. If yes, circuit OK. If no, circuit may be broken between bulb and alternator.