I got the correct 3 watt OEM bulb in the battery charge warning lamp.
I also tested to see if the amps are increasing enough when the loads are placed on the charging system. Amps start out at about 17amp draw with nothing on, engine running, and car in park at idle. Then as I turn things on amps go up. With ac, blower on high, radio, headlamps on, engine running at idle in park..the amps go up to about 59amps However, the battery is still not staying at around 12.5-13 volts. It drops down to 11.9 or less

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red