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Final update: I found a switch that works. I got a $12.99 generic “Universal 3 Wire Engine Starter Switch for Car, Motorcycle, Tractor, Forklift, Truck, Scooter, Trailer,...l from the_amazon, and it works great. The switch itself is very light weight and feels cheap, but I like the key better...

Final update: I found a switch that works. I got a $12.99 generic “Universal 3 Wire Engine Starter Switch for Car, Motorcycle, Tractor, Forklift, Truck, Scooter, Trailer,” from the_amazon, and it works great. The switch itself is very light weight and feels cheap, but I like the key better...

Update: I installed a Kascar auxillary grounding harness, and nothing changed.

Yes, it starts when I put the factory switch back on. It does not start with the keyed ignitions. Thank you!

I have tried three different keyed ignitions on the HMMWV, and none of them have worked correctly. The first one I got from Federal military parts. I used a multi-meter and made sure the wires from the vehicle were labeled correctly (Battery, Ground, and Ignition). I wired them to the new...