64-6601 - Replacement Trigger Switch for Lightning 300A/400A MIG Guns

Fix Your Lightning Gun and Get Back to Welding

Is your MIG gun acting up? If you are squeezing the trigger and getting nothing, or if you have to wiggle it just right to get the arc to start, it’s time for a new switch. The 64-6601 Trigger Switch is the direct replacement for Lightning 300A and 400A MIG guns. There is nothing worse than a reliable gun letting you down in the middle of a bead because of a cheap plastic switch failure. This part is designed to get your equipment back up and running quickly so you can stop troubleshooting and start burning wire.

Replacing the trigger switch is one of the most common repairs on a MIG gun, and using the correct part makes all the difference. This switch fits perfectly into the Lightning handle, meaning you won't be jamming it in or taping it up. It connects securely to your control leads, providing a crisp, responsive click every time you pull the trigger. Whether you are running a 300-amp setup for general shop work or pushing a 400-amp gun on heavy plate, this switch handles the signal reliably.

Don't let a small part hold up a big job. Keep a spare 64-6601 in your toolbox or maintenance locker. When a trigger fails, it usually happens at the worst possible time. With this replacement, you can swap out the bad switch in minutes. It restores that "like-new" feel to your gun, ensuring that when you're ready to weld, your machine is too. Compatible with the popular Lightning series, this is the hassle-free fix for intermittent starts and dead guns.