Charging indicator light (Renault 19)

The control lamp on the instrument panel has two positive contacts, namely, on one side, from terminal "1" of the generator (white wire) and, on the other hand, from terminal "A2" of the ignition switch relay (yellow wire), coming through a multi-pin connection behind the instrument panel.

When the ignition is turned on, voltage is supplied via the yellow wire. The generator is not yet running, so the white wire functions as a "minus". The control lamp lights up, since there is a voltage difference between the on-board network supplied by the battery and the generator.

When the engine is running and the alternator has reached normal speed, the voltage regulator connects the alternator to the electrical system. The positive charge is supplied through the yellow wire and additionally through the white wire. There is now no voltage difference and the charge indicator lamp goes out.

When the ignition is turned on, the charge indicator lamp should activate the generator. This way, it can produce electric current at low rotation speeds. Of course, this is only required when the generator is first started.

(The original can be found on the website: RENAULTBOOK.ru)