Device for compensation of voltage drop at light sources of a vehicle with electrical auxiliary charging device

A device for compensation of voltage drop at light sources of a vehicle, said device comprising:

• light sources (4a-4n) having a resistance R0 and connected to a vehicle battery (3);
• an auxiliary charge device (1) comprising an electric motor (2);
• said electric motor (2) having an on/off switch (6);
• said electric motor (2) connected to the vehicle battery (3) and connected parallel to said light sources (4a-4n);
• a resistor (5) serially connected upstream of said light sources (4a-4n), wherein said resistor (5) is selected, based on said resistance R0 such that a nominal current I flowing through said light sources (4a-4n) causes a voltage drop ΔE=I×R in said resistor (5) that matches a voltage drop occurring when said electric motor (2) is switched on;
• a first switch (7) connected parallel to said resistor (5) for short-circuiting said resistor (5) when said electric motor (2) is switched on by said on/off switch (6).