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I unplugged the fuel pump, turned the key and tried the lights. Perfect, no flickering at all. I wonder if wiring up a capacitor for the fuel pump might solve the problem. I've heard people say that you should wire a capacitor at each light but that would mean six caps for the headlights and taillights.

I upgraded the lighting on my 1988 Mule 1000 KAF450. Changed the ancient dim headlights to LED bars and the 1157 taillight bulbs to LED as well. They are flickering / pulsing at a pretty fast rate. Anyone else experienced something like this? I've heard that this kind of problem can sometimes be fixed with a capacitor. The resistor fix for hyper flashing on cars doesn't seem right for this issue. The fuel pump makes a fast ticking noise and the flickering of the lights seems to be in sync with that. Don't know if the fuel pump is creating some sort of interference in the electrical system. The flickering happens whether or not the engine is running. I connected one of the lights across the battery terminals to test it and it lights up beautifully with no flickering. I would like to see if anyone with some more electronic chops than me has dealt with this problem before. Thank you.