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Hi, this is Wayne here from Sears PartsDirect. Today we’re going to talk about troubleshooting a riding lawn mower that shuts off when you release the brake. Most riding mowers have a seat switch that kills the engine if you release the brake when no one is sitting in the seat. This essential safety device ensures the mower stops if no one is in control. If the seat switch is broken, it shuts off the engine even when you’re sitting on the seat. Our troubleshooting will focus on that seat switch. Fixing this problem may be as simple as plugging a loose wire harness back into the seat switch. If the harness is unplugged, the engine always shuts off when you release the brake—that way, no one can bypass the seat switch. Make sure the seat switch wire harness is plugged in securely. If you can’t tell whether the wiring harness is fully plugged in, remove the seat from the bracket. Pull out the retaining bolt, press the seat adjustment lever and move the seat fully forward. Use a slot screwdriver to release the locking tab and pull the seat off the bracket. Hold the adjustment lever against the seat bottom as you pull the seat off, so the lever doesn’t fall. Now you can check the wire harness connection to the seat switch and plug the harness back in if it’s loose or disconnected. If the harness is plugged in securely, check the seat switch next. Unplug the wire harness and remove the switch from the seat by rotating it a quarter turn and pulling it out. If you find visible damage, replace the seat switch. If the switch looks okay and you’re not sure whether it’s broken, test the switch with a multimeter. With the multimeter set to measure resistance, touch each inside spade with a meter probe. It should measure near 0 ohms of resistance. Now, press the switch plunger in while holding the probes on those spades. It should measure infinite resistance. Repeat the process on the outside spades. It should measure near 0 ohms of resistance with the plunger released and infinite resistance with the plunger pushed in. Replace the seat switch if any of these resistance checks fail. If the seat switch passes all the resistance checks, then a short in the wire harness could be shutting off the engine when you release the brake. Check the wire harness and repair any damaged wires. These tips should help you fix your riding lawn mower so you can get back to mowing. I hope this video helped you out today. You can find links to any parts we talked about in the video description below. Check out our other videos here on the Sears PartsDirect YouTube channel. Subscribe and we’ll let you know when we post new ones.