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wheelhorse-c-161-1979

Auto 18. Help rewiring ignition after electric fire.

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Well my '73 auto 18 was running great yesterday until the engine died and quit.  Next I see smoke rising from under the hood.  There was short in the wire harness and wire was burned right to the copper. I reached in and was able to stop the tractor from goin up in smoke. I just ripped out the shorted wire harness and it stopped.  So i took out the battery and went to work.

I looked at the wiring diagram, which seems straightforward until you try to match it up with the ignition switch.

After spending a couple of hours rewiring, I can not figure out which wire goes where in the ignition.

Can any one help me as I am totally at a loss.  The letters on electrical diagram  around the ignition sketch don't match anything i see on the actual ignition.

Would anyone be able to give me a hand. I don't need to compound problems by experimenting with wire combinations on the ignition.

Very grateful for any help.

Thank you.

Jack

 

wiring-auto18.jpg

auto-18iginition0.jpg

auto-18iginition1.jpg

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Download this file
http://www.wheelhorseforum.com/files/file/1209-wh61-90-134-ignition-switches-1972-modelspdf/

The one you want is named
WH61-90 #134 Ignition switches 1972b.pdf

The original ignition switch 101917 was replaced by another shown on the last page. I think that will help and being in pdf format you can print out that page.

Garry

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Hi Gary,

Thank you so much for the quick reply!  Even though it's a 73', I guess '72 switch models being used would make sense.

I'm going purely by comparing visually the graphic to the actual ignition tab connectors. I guess this is the one that seems to best match up with what I have.

I just love this forum. It has helped me so much. It's wonderful :) I'll give it a shot putting the wires where they say they should. Hopefully it won't go boom!

 

XAUTO18.jpg

CORRECT-IGNITION.jpg

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Once you get it figured out there is a connector available that takes the guess work out of it next time. This one is supplied by Stens
https://www.bantasaw.com/catalog/viewproduct.asp?i=205&p=3054
or it is available with wires in each cavity
https://www.bantasaw.com/catalog/viewproduct.asp?i=205&p=1326

If you don't like the wire color locations the terminals can be released and inserted where you want them. A 1/16" or 3/32" cotter pin opened up makes a good terminal release tool. Can explain how it is done if you don't know.
Napa also has this harness and they likely have the bare connector also.

Garry

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Hi Gary,

Thank you so much for the quick reply. Even though it's a 73' I guess '72 switch models being used makes sense.

I'm going purely by comparing visually the graphic to the actual ignition tab connectors. I guess this is the one.  

I just love this forum. It has helped me so much. It's wonderful :) I'll give it a shot putting the wires where they say they should. Hopefully it won't go boom!

 

Well, guys thank you again for the help! Inside of a few minutes got the wires back in place on the starter and she started right up!

No way I could have done this without those helpful schematics. The owners manual just didn't cut it.

So thank you and best to all!
Jack

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