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Fast flashing usually indicates that one of the exterior bulbs isn't functioning. You've checked front and rear signal lights, right? If the bulb is good, it could be corrosion in the socket, bad ground, broken wire, etc.
the signal indicator lights are suppose to flash in perticular time interval which is connected to a timer relay when the light flashes faster that means the other light is not working and the relay is getting double the current and moving faster so check the other light either the bulb is fuse or the current is not reaching up to the bulb
Gday mate, we had a problem with another late model vehicle similar to that, the bulb that was put into the reverse light was not exact brand product ( ohmage was slightly wrong ) and fowled up computer, correct bulb in place and disconnect battery to reset K A M ( keep alive memory) problem solved, BEWARE, some vehicles cannot have KAM reset except for dealer computer tethered reboot , just try putting the factory correct bulb(s) in and see how it goes, geoff. hope this helped.
Your bike is not equipped with the old style "flasher" like they used to be back in the '80's. You bike has what Harley calls a Turn Signal Microprocessor. It's a "black box" about a half inch thick by an inch and half wide by three inches long. It has a large plug with about a dozen wires on one end and a mounting bolt in the center of it. Exactly where it is, I have no idea as Harley moved these things around as much as they did the oil drain on the Sportsters. Underneath the battery is a bad place for anything, especially electrical components. The faint clicking sound you're hearing may be a circuit breaker. By the signals flashing very rapidly, this would indicate a high current flow that may be caused by a short circuit.
Concentrate on the front indicator.
With a meter check you have an intermittent supply with the ignition on and left indicator selected.
If its ok, it will be an earth (ground) problem. Check using a temporary earth wire from the indicator unit to the chassis.
If no voltage found at indicator bulb, trace the supply cable back to source.
If you have changed the blinkers over to LED lights , you need to put diodes on the wires to stop the fast flash. Honda turn signals Have to grounded to the green ground wires in the harness. You can not ground them to the frame or other wires or the flasher system will not work correctly. Double check that all the wires are connected to the harness correctly (They are color coded). Blue with white band is the same as blue with white stripe. Orange with white band is the same as orange with white stripe. If you have crossed the wires on the front turn signals you may be powering the rear turnsignal with the running light. The running light is the dimmer half of the bulb. The turn signal/flashing light is the brighter side of the bulb. Inspect your wiring carefully.
You may have some wiring 'grounding' problems in the areas of concern. Remove each connection, and clean any rust. Place a light film of grease and a fresh star washer next to ground point, then the wire connector and other washers. Tighten firmly. Check the lamp sockets for any corrosion and replace same if found. The front lamp flashes rapidly because the rear light not working causes the flasher unit to switch faster.
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