TOP-LAMP ball bulb, 24 V/21/5 W, base BAY15d
The TOP-LAMP round bulb is a twin-filament bulb for 24 V systems with BAY15d base. In combination lamps, the 5 W filament provides the tail light and is lit continuously, while the 21 W filament provides the brake or indicator light.
The offset bayonet pins of the BAY15d base allow only one fitting position, so that the two filaments cannot be swapped. A bulb with pins at the same height does not sit in the correct position in the holder and is no substitute. When replacing, check the voltage marking on the old bulb.
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