YM240 starting issues

[Cjessee]

I have a YM240 that I use as a lawn mower. I am having a no crank issue. It does not even click when turning the key to the start position. If I use a jumper cable and put power to both the key switch terminal and battery positive on the starter solenoid it will crank just fine and start. Even when running and with the key in the run position I have no headlights, turn signals, or horn. Even the dummy lights do not come on now.
I do not have a shed to store my tractor inside out of the weather. I think that the ignition switch may have went bad. Asking for any advice from those of you who may have run into this problem before. I really do not want to just start throwing parts on it. I would prefer to diagnose the problem, if anyone has the knowledge and schematics to help. I would greatly appreciate any help offered. Thank you

 

[CoyPatton]

Have you checked the integrity of your wiring? Critters seem to love building nest under the dash and wiring frequently ends up compromised.

If your battery is good, you should be able to jump terminals at the starter to get it to crank.

 

[Cjessee]

Wiring seems good. Battery is less than a year old. I will give it a good charge and see if that changes anything. Thank you

 

[rScotty]

I think CP means jump the big terminals at the starter solenoid, not at the starter itself.

But it's probably the ignition switch. They are known to have a limited lifespan in the weather. I mean, look at how the switch is designed.....

They angled the opening to the weather to allow it to fill with water, but forgot to put in a drain. Plus it is stuffed with carbon steel (rust prone) springs and various different metals for the contacts and circuits in close proximity inside. If you add rain water and a bit of air pollution the darn thing is almost a battery....and if that isn't enough, it is actually hooked to a real battery. The wonder is that that the ignition switches last as long as they do.
rScotty

I have schematics if you'd rather....but if it were mine I'd check the fuses first and order an ignition switch second.

 

[careyo63]

I had problems with my starter not long after buying it. YM2000 same as you 240. Finally ended up taking it to a Auto Elec. shop and they rebuilt it. Your need ****. volt meter.

 

[CoyPatton]

I think CP means jump the big terminals at the starter solenoid, not at the starter itself.

But it's probably the ignition switch. They are known to have a limited lifespan in the weather. I mean, look at how the switch is designed.....

They angled the opening to the weather to allow it to fill with water, but forgot to put in a drain. Plus it is stuffed with carbon steel (rust prone) springs and various different metals for the contacts and circuits in close proximity inside. If you add rain water and a bit of air pollution the darn thing is almost a battery....and if that isn't enough, it is actually hooked to a real battery. The wonder is that that the ignition switches last as long as they do.
rScotty

I have schematics if you'd rather....but if it were mine I'd check the fuses first and order an ignition switch second.

I am not a fan of the throw parts at a problem mindset. 1st it can get expensive quick. 2nd if you have either a bad connection or bad wires, throwing parts will not help and see #1.

It may well be the ignition switch, I have seen them busted apart from water freezing in them, but again I prefer to do a bit of checking personally. These machines are pretty simply although confined spaces often to work in. A few checks visually and a few more with a volt meter gives confidence.
Checking the fuses is such a routine process that I failed to mention it. Good catch rScotty!

 

[California]

Get a voltmeter or at least a 12v bulb in series with a wire.
Check if 12v is arriving at the 'ignition' switch.
If yes, and no 12v comes out of any of the terminals, replace the switch.
If no, trace the 12v circuit to the switch.

YM240 diagram:

 

[California]

My YM240 had an unreliable ignition switch and the prior owner had botched the clutch safety switch, and replaced the starter, without improving anything. Don't do this.

After replacing the switch I tore it apart and found it packed solid with dead pillbugs.

 

[FleetMan]

Have you disconnected the battery cables and cleaned the battery posts and terminal ends? Corrosion can and does build up and does block the connection. It happened to me twice over the past 15 or so years. The last time I coated the battery terminals with dielectric grease and have not had a reoccurrence.

 

[California]

Have you disconnected the battery cables and cleaned the battery posts and terminal ends?

He said it cranks fine if he jumpers the starter solenoid. But no headlights etc. So the problem has to be no power arriving at, or going through, the ignition switch.