I started to change out the rear brake and front turn-single lights to LEDs. I found out that when all four bulbs were replaced the turn signal flasher would not work. By replacing two of the bulbs with normal filiments it worked. I assumed that the LEDs had less current draw and with all 4 bulbs, there was not enough to activate the flasher. I used APC units avialable from Summit Racing. They run about $10 each. I ended up only having the rear brake light with the LED.
The other backup and running lights were not worth the cost to replace to LEDs.
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