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No spark on a craftsman 502 rider mower. wiring diagram? i ONLY HAVE TWO WIRES GOING TO ENGINE ONE IS HOT AND ONE IS GROUND BUT NO WIRE ON/OFF FROM KEY. HAVE REPLACED SAFTEY SWITCHS AND CHECKED BATTERY ALL GOOD. BUT NO SPARK AT PLUG
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Switch Terminal to circuit color. B Red S White M Black (Black/white) A1 Blue A2 Black L Black G Black
Unfortunately 4 of the circuits are not uniquely color coded. If the black wires have been disconnected from the switch socket then it will be necessary to identify each black wire to its respective circuit.
The safety features on the riding lawnmowers can be hard to troubleshoot. 1.The starter should NOT operate when blades are engaged. 2.Spark will not occur without a rider ON the seat with the blades engaged, 3.Spark will function with the parking brake on (on some models) Theirs two wires coming out from under the engine top cover,(for a Briggs) One is for charging and the other is the kill switch. If you remove the kill switch wire then attempt to start and the magneto is good you will have spark. DO NOT use mower without the safety functions connected. If you have spark with the kill wire removed then the wiring and /or switches are faulty Make sure the plug is against the ground or it will not spark. We can go from here. Good Luck
just wire it back together, you don't have to worry about crossing the wires up. because it's just a hot and ground for a coil to magnitize to ingage the pto clutch.
You need to find out if the switches are normally open or closed, that can be done with an ohm meter. Then bypass each one at a time either by just disconnecting the switch or by putting a jumper wire between the contacts (wires off switch). For example the seat kill switch is normally open while operating (no connection) it closes (makes connection) when seat is raised (rider off) and grounds the ignition to shut down the motor. Hope this helps
Appears the ground wire on the carburetor came off. You can kill it by shorting out the spark plug with a screwdriver to the head or anything metal. Locate the wire to he carb and trace back to where it goes to the ground and make sure you got a good connection.
It sound like the wire that connects the ignition system to the starter switch and then to the tractor ground has failed, easiest way to test this is while the engine is off install a 12" piece of 12 gauge wire with both ends stripped about 3/4" between the sparkplug cap and sparkplug and being very careful that you do not touch the bare wire start the engine up and then touch the bare end of the wire you just installed to a good ground and see if the engine quits if it does somewhere between the ignition modual and ground the circuit has opened up, likly candidate would be the key switch. Hope this helps Don
In order for there to be a spark at the plug, make sure the plug is grounded to the engine, it will not "fire" if it isn't.
Remove the cover with the crankrope, there should be a thin black wire going to the coil, going to a ground lug that kills the engine. Try unplugging this wire and re-check the fire...if it fires, there is a fault in this wire and should be replaced. The mower will run without it, but will not stop without "choking" out the engine
What is the model number under the seat? Starts with 917.
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