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In Reply to: Scotts S1742 Lawn Tractor wont start... posted by Chris on Thursday, July 02, 2009:
I just upgraded and moved my ignition switch (to plastic assembly around the steering/gas tank) yesterday.
The ignition works like this:
Red wire: Battery (obviously)
Purple (may have blue from fade): Starter relay
Yellow: Fuel cut-off/lights
White: Magneto Ground
Black: Ground
Ok, works like this:
When turn the key on, power is sent to the Yellow (fuel cut-off/lights) as a constant source. The fuel cut-off works by electrically engaging an actuator located in the bottom of the carb. The actuator pulls a rod down to open the main jet in the carb and allowing fuel through the carb and go into the engine. When you remove the power source (key off) from this actuator, the rod gets shut by a spring located in the actuator and causes no fuel to be able to reach the engine and therefore will not run. (This was my issue)...
The white wire, is grounded only when the key is off and prevents spark when you turn the key off (kill switch).
The purple wire is the tricky one. The purple wire goes from the ignition switch, down to the front left (by the carb) and under to the safety switch for the mower engagement. It then loops over to the brake safety engagement switch. After that it goes back to the starter relay and connects to the ignition switch connection of the solenoid.
Red wire goes to a split that runs to two places (as well as an inline blade fuse). One being the starter solenoid (connected to the battery post connection) and the other is the voltage regulator next to the starter (wire is red with black stripe to that).
Black is just ran to the chassis for ground.
My mower is second hand and the last person messed it all up trying to bypass the safety switches, so I have gotten to know the wiring haha...
First, check to make sure your ignition switch is good. The one I just replaced didn't give a constant power source and that caused no fuel to be able to get into the engine. You can check if constant power works by making sure the lights are on when the key is on.
Make sure all safety switches are engaged fully. I had an issue where it thought the mower was engaged because the handle wasn't far enough back for it to know it wasn't engaged.
In theory, you could use a jumper to connect the purple from ignition switch to the starter relay to bypass the safety switches. There are also other safety switches that run to a relay under the seat.
I for one need to replace said relay, because my back-up switch doesn't work while the mower is engaged due to rust inside of the relay...
I'm no artist, but drew up a quick diagram off the top of my head for reference.
Hope this helps you!
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