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By 953 nut
I have a few basic electrical system diagrams that are helpful in understanding how the wiring system works. They are not specific to any particular tractor and do not include safety switches. All use the 5 post ignition switches 103-991 for Magneto and 103-990 for Battery Ignition. I failed to include fuses in the Starter Generator drawing, this is an over-site and I would encourage fuses be used as shown in the other two drawings.
Hope this is helpful.
Magneto Ignition system with electric start and solenoid.
Battery powered ignition system with points, condenser, solenoid and electric start.
Battery powered ignition with solenoid, points, condenser, Starter Generator and a mechanical voltage regulator.
We have uncovered a shortcoming in the factory wiring diagrams for S/G battery ignition systems with a four terminal voltage regulator. The wire from the regulator "Gen" terminal to the S/G "A" terminal was omitted. This drawing should clear that up.
I'm having some trouble with my 418-A. I think it is ignition related, but I'm not completely sure. It starts and runs perfectly fine, but when I go to turn it off, it doesn't work. I can just turn the key into the 'off' position and take the key out while the tractor is still running and it will continue to run as if I hadn't turned the key off.
I'm trying to keep this tractor as original as possible, so I don't really want to buy a new ignition. Any help is appreciated. Thanks!
Wheel Horse 418-A
Model No. M18QS
Spec. No. 24510
Serial No. 1619706606
By RJ Hamner
Let me first say that it ran when I brought it home. Drove it around the guys yard, tried out the mower, drove it onto the trailer and drove it off the trailer and into the garage.
I've done a "ground up" restore on the tractor (70 Charger 12). Swapped out the breakerless for a battery ignition and swapped out the 10 amp for a 15 amp stator, flywheel and regulator.
Pulled the head, looked pretty good, new head gasket and head bolts.new fuel pump, fuel lines,new switches and wiring, new aftermarket carb, new coil, coil wire, new points, new throttle and choke cables.
Static timed (twice just to make sure) Have tried Autolite 216's and the hotter 437's. changed the condenser to the high dollar Kohler one.
It will idle but when I give it some throttle it stumbles or will rev up a little then quits.
I've gone thru the "trouble shooting " steps multiple time and to no avail
Anyone got any ideas?? I am willing to try most anything at this point
I am hoping one of you knowledgeable lot will be able to help me out. I am fixing, as a surprise for my father, the ignition (that he took apart initially!) on our Wheel Horse 312-8. As we are in the UK we have struggled to get the ignition and loom which would have made this slightly easier. as the previous loom had melted slightly and a few wires came 'melted together'. And it is here where my problem lies. I have managed to get an ignition from a reputable provider here in the UK, but failed to get the loom. After visiting various local dealers they recommended I just connect the wires using spade connectors.
From images of the ignition prior, I have been able to connect most of the wires into the new ignition with ease however where some of the wires were twisted and burned together I am struggling to work out which wires go to the remaining terminals. I have found various manuals (most helpful one attached) and think I have followed them well. However I am left over with a small red wire of which I am unsure as to where it goes.
The three wires I was left with were: a white wire, a large red wire, and a small red wire. I know that the small red one but join either the big red or the white but I am unsure.
What I would have ideally is someone being able to send across a photo to ensure that I can't get this wrong or to be able to say definitively where it joins. Furthermore if you can see any basic errors you feel I may have made an help on that would be graciously accepted.
This is my first post but as I try to fix more and more parts it certainly won't be my last!
Hope you can help gang!
***This is all the info I have on the mower:
Toro 312 - 8 Cast Iron Kohler 12 HP Engine
42" side discharge
Manufactured circa 88/89
Vin/Model No: 78346
Serial Number: 3900161
Parts & Service Manual - E1 12K802/ R1-12 K01 8 Speed ***