I replaced the headlight of my bike with a new incandescent light and replaced the front turn signals with LED bulbs. The bike has functioned normally for about a year now since doing the conversion. The other week, I purchased an LED taillight/license plate/turn signal combo for the rear. I hooked all the wiring up and when I turn the bike on, I get a buzzing/whining noise while it's running. If I unplug the turn signals and leave the taillight hooked up with the incandescent rear signals, there is no problem.
What is going on with my bike? I assume the starter relay is fine as the problem only occurs when all electronics are hooked up to LED. Do I just need load resistors for the rear flashers? Do I need load resistors for everything that uses an LED bulb? :mbird