The alternator does not charge the battery on my 87 DeVille. The alternator is good. The battery charge warning light is out.
I believe the alternator field energizing current flows through the bulb when the ignition is turned on.
Can anyone tell me if there is a resistor in parallel with the bulb to allow the current to pass when the bulb is burned out? If so, what is the value and watt rating of the resistor and where is it located?