Z4217 Husqvarna 2005 The engine starts and runs but as soon as I release the park brake the engine does. Seat switch is good and I have bypassed it and it still does the same thing. The seat switch only has 2 wires and they are both green.

SOURCE: seat safety switch on cub cadet z force 50

you could splice the wires and by pass the switch all together.

SOURCE: simplicity mower stalls when brake released

There is another safety switch connected to the parking/service brake. Check that one too. Sounds like its the one.

SOURCE: engine dies when clutch brake released on husqvarna gth2548

First check the seat switch,make sure it is plugged in tightly, these plugs have a safety tab built into them that will cut the engine off if you unhook it,sometimes the plug latch pulls out slightly and this will cut the engine, There are two other switches in the system one on the foot clutch and on on the mower clutch, if you follow the white wire from you ignition switch it will lead you to both of them,check those connections also.

SOURCE: riding mower dies when releasing brake

the seat switch is the problem. the switch itself could be bad, but usually theproblem is that the connector is just not plugged in all the way [by the way, trying to bypass the switch by inserting the wire doesn't work because there is a "switch" inside the connector to prevent you from doing just what you did]

SOURCE: husqvarna zth quits when releasing parking brake

check the safety switches on each lever