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In some states, the headlight and tail light modulators are illegal and you bike will not pass inspection.At least that was the case in VA quite a few years back.I currently have one (installed by the previous owner) on one bike with a 3 position headlight switch. High beam, low beam, and irritating flashing beam!
Head light modulators are legal in all US states, per federal law. Iím not going to look it up for folks, but itís simple to look up. Brake light flashers are something else, I donít know law on those.
(Federal Motor Vehicle Safety Standards) (49 CFR Part 571.108 S7.9.4) allows motorcycle headlight modulation systems all 50 states provided they comply with the standards set forth in this section.Title 49 USC 30103 (b1) (US Codes) prohibits any state from forbidding a system that conforms to FMVSS 108.Lamps, reflective devices, and associated equipment Ė S7.9.4 Motorcycle headlamp modulation system.S184.108.40.206 A headlamp on a motorcycle may be wired to modulate either the upper beam or the lower beam from its maximum intensity to alesser intensity, provided that:* The rate of modulation shall be 240 Ī40 cycles per minute.* The headlamp shall be operated at maximum power for 50 to 70 percent of each cycle.* The lowest intensity at any test point shall be not less than 17 percent of the maximum intensity measured at the same point.* The modulator switch shall be wired in the power lead of the beam filament being modulated and not in the ground side of the circuit.* Means shall be provided so that both the lower beam and upper beam remain operable in the event of a modulator failure.* The system shall include a sensor mounted with the axis of its sensing element perpendicular to a horizontal plane. Headlamp modulation shall cease whenever the level of light emitted by a tungsten filament light operating at 3000 deg. Kelvin is either less than 270 lux (25 foot-candles) of direct light for upward pointing sensors or less than 60 lux (5.6 foot-candles) of reflected light for downward pointing sensors. The light is measured by a silicon cell type light meter that is located at the sensor and pointing in the same direction as the sensor. A Kodak Gray Card (Kodak R-27) is placed at ground level to simulate the road surface in testing downward pointing sensors.* When tested in accordance with the test profile shown in Figure 9, the voltage drop across the modulator when the lamp is on at all test conditions for 12 volt systems and 6 volt systems shall not be greater than 0.45 volt. The modulator shall meet all the provisions of the standard after completion of the test profile shown in Figure 9.* Means shall be provided so that both the lower and upper beam function at design voltage when the headlamp control switch is in either the lower or upper beam position when the modulator is off.S220.127.116.11 Each motorcycle headlamp modulator not intended as original equipment, or its container, shall be labeled with the maximumwattage, and the minimum wattage appropriate for its use. Additionally, each such modulator shall comply with S18.104.22.168 (a) through (g) when connected to a headlamp of the maximum rated power and a headlamp of the minimum rated power, and shall provide means so that the modulated beam functions at design voltage when the modulator is off.2 Instructions, with a diagram, shall be provided for mounting the light sensor including location on the motorcycle, distance above the road surface, and orientation with respect to the light.
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