Resistor for alternator lamp (if the lamp does not go out) See service bulletin 82-02

If the battery charge indicator lamp does not go out after starting the engine, the exciter current is too weak because of the 2-watt lamp. In this case, supplied resistor (911.641.981.00/91 ohms, 5 W) must be installed parallel to the battery charge indicator lamp 

• Remove instrument cluster and take out battery charge indicator lamp socket.
• Install both piggyback terminals on both sides over the lamp holder
• Connect bulb socket again and install instrument cluster
• Recheck battery charge indicator lamp operation and, after running engine briefly, tightness of drive belt

* BA7 version for >81 car's