It is important to know the min amp draw of the flasher being used. An LED lamp on ‘turn’ function draws appx 10% of what an incandescent in the same application would draw (250 milliamps vs. 2.5 Amps).
Original Equipment flashers will all have a minimum amount of Amp draw to make them open and close, so they are not operating all the time. Typically that is 2 Amps, but in some newer versions it is only 1 amp.
If you change only the rear lamps to LED the flasher will think you have a lamp out and will begin the rapid flash. If you change all lamps on the turn circuit to LED, you will need to install Load Equalizing Resistors on each side.
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