1. (a) Headlamps--Lower Beam Outage Compensated by Upper Beam. Voltage to the upper beam filaments as reserve lower beam headlamps when one-half or more of the lower beam filaments fail shall be not more than 50% nor less than 40% of the design voltage of the upper beam filament.
2. (b) Headlamps--Upper Beam Outage Compensated by Lower Beam. Voltage to the lower beam filaments as reserve upper beam headlamps when one-half or more of the upper beam filaments fail shall be not less than 75% of the design voltage of the lower beam filament.
3. (c) Taillamps--Outage Compensated by Stoplamps. Voltage to the stoplamp filaments as reserve taillamps shall be not more than 50% nor less than 40% of the design voltage of the stoplamp filament.

When the alternate circuit lamps are connected and the design voltage is applied to the input terminals of the device, voltages at output terminals shall be as follows:

Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24012 and 26103, Vehicle Code.