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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 953 (Daytime Running Lamps System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Daytime Running Lamps (DRL) >> Principles of Operation

Principles of Operation

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The daytime running lamps (DRL) are implemented by using the low beams at a reduced voltage of approximately 80% system voltage. This is accomplished by inserting a resistor in series with the low beam filaments. When the headlamp switch is engaged, the daytime running lamp function is disabled and the low beam filaments receive 100% system voltage.

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