One last thing to consider, to switch to LEDs, you have to replace the flasher with an LED compatible one. IF the problem is in the ground circuit, you have a bad connection/wire. IF the problem is in the supply circuit, there's a good chance you've got a dirty turn-signal switch (or bad wire connection or bad fuse).

> Ground circuit: put your RED voltmeter lead on the positive terminal of your battery and check the voltage at the socket (ground side), if it's low, you know that the problem is in the ground portion of the circuit. > 12V supply circuit: put your BLACK voltmeter lead on the negative terminal of your battery and check the voltage at the socket (supply side), if it's low, you know that the problem is in the supply portion of the circuit. This is easy, to see if the voltage drop is happening due to the: If the voltage is still low (less than 11-12V), you will need to determine whether it's the supply wire or ground. If you want to get a true volt reading at a turn signal socket, remove (or disconnect) the turn signal indicator lamp in the console.Īfter you have removed/disconnected that lamp, re-check the voltage at the turn signal socket. The original wiring of turn signals has a weird hook up across/through the console indicator bulb. If you only have 6V at the bulb, you have a problem. Here's a diagram I drew of the turn signal wiring: The ones I last bought are non-polarised (they work with 12V/GND switched). The automotive replacement LEDs are all 12V. The other issue I ran into was with the housings I was using: the british customs blinkers came wired backwards, so hot was wired with a black wire, and the ground was white - it didn't matter for the incandescent bulbs that came with them, but the LEDs don't like that and you won't get anything if they're wired backwards. Pulling the brake lever lit up the flasher idiot light and nothing else :frown2: but once I wired in the resistors everything worked fine.If you've got regular incandescent bulbs on the back end, you shouldn't need a resistor though, and none of this will be of any assistance at all to you. If you've already got LEDs in the tail, you might need to wire in some resistors to get things working properly - I put LED blinkers up front and removed the tail light on my bonnie and made some custom runner/brake/blinkers for the rear using LEDs and a harness to split the blinker/brake signal properly, and none of it was happy at all until I got a resistor in the line somewhere. does anything happen when you've got the LEDs hooked up? rear signal work okay? dim led? I'm no electrician, but I do know that LEDs can mess with electronics due to their low draw.

12 volt led lights motorcycle