Rebaydo 1pc 17" LED Third Brake Light for 6 Volt vintage and classic vehicles features dual brightness for taillight and brake light operation and works on both positive ground and negative ground electrical systems with a non-polarity design. Operates from approximately 3.2 to 7.8 volts and is comparable to a 40 to 45 watt incandescent bulb while using up to approximately 720mA at 6.8V (4.9 watts) for the brake light and up to 88mA at 6.8V (0.59 watts) for the taillight. Available with Red or Yellow/Amber LEDs. The assembly measures approximately 17" long, 1.1" wide, and 0.7" high with two recessed 0.165" mounting holes spaced approximately 16.14" apart for surface mounting. If mounting to glass, double-sided tape or a custom bracket will be required. Three 7.4" wires exit from the rear approximately 6.57" from one end and are color coded: Black for ground, White for taillight, and Red for brake light. The lamp uses nine super flux LEDs for high brightness. The polycarbonate (PC) lens is D.O.T. compliant and features seven magnifying lenses, two diffused lenses, and an overall diffused lens pattern for excellent light distribution. The rear housing is fully encapsulated in epoxy for protection against moisture, water, and snow, providing an IP67 rating. Long life is rated up to 30,000 hours. Can also be used as a turn signal. RoHS listed. Please see the mechanical drawing for complete dimensions. This product is marked NCNRNW (Non-Cancellable, Non-Returnable, Non-Warranty). Because this light is designed specifically for properly regulated 6 volt systems, overvoltage will permanently damage the LEDs. Please verify your charging system is correctly regulated to approximately 6 volts before installation. Compatible with Ford Model A and Ford Model T.