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Garden Tractors Discussion Forum

Cub Cadet 108

Author  [Modern View]

05-20-2014 19:56:15

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I have a starting problem. When you turn the ignition switch to the start position nothing happens. You can start the engine by running a jumper cable from the battery to the starter. Works fine.

I have changed out the ignition switch and solenoid. I have also shorted or direct wired the safety switches. It"s a puzzler.

Could you run a cable from the battery to the starter with a starter switch (on/off) in between?

Ideas will be appreciated.


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05-21-2014 20:43:09

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
First thing is download the PDF for the electrical on a 108. You need to "ring out" the circuts. I use a meter set to the ohms setting and it sqweeks when the wires are correct. "B" on the switch is the 12volt power from the battery. There is a fuse in that line. Find that sucker first and see if you have juice. I have a 108 that is damn near MINT. Garage kept and over 95% original. You have something goofy somewhere and just take your time. Get that schematic first!

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ken house

05-21-2014 13:13:06

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
almost same problem with 122. place jumper wire from battery to starter and then there is a switch on tractor, between knees, that you have to turn to get the starter to work.

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05-21-2014 16:01:10

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 Re: Cub Cadet 108 in reply to ken house, 05-21-2014 13:13:06  
That's a good idea. I'm going to do some more checking as per the suggestions by others. I have a 300 amp cut off switch that should work. What kind of switch did you use?

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ken house

05-21-2014 17:37:37

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 Re: Cub Cadet 108 in reply to jb9959, 05-21-2014 16:01:10  
it was already done. i have no idea.

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05-21-2014 08:59:49

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
When you say you changed out the ignition switch, did you use the correct part?

When I was working on my 108 I tried a Toro switch, since I work for a Toro dealer.
The three teriminals did not do the same things. I had to switch the wires in the plug to get it to work.

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05-21-2014 11:24:35

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 Re: Cub Cadet 108 in reply to t.r.k., 05-21-2014 08:59:49  
The ignition switch came off a running CC 147 that I parted out.

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joe csuti

05-21-2014 05:12:24

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
With a voltmeter/12v test light check that you have 12v at battery terminal(b) on ign sw,if not then starting at ign sw follow battery wire back thru ammeter to battery terminal on starter sol,check for loose/bad connections or possibly a bad ammeter,check for 12v at each terminal of ammeter or put a jumper across meter terminals & see if that cures problem.

IF you have 12v at battery terminal of ign sw,then check pto/brake sw as steve said,these 2 sw's are wired in SERIES,both sw's MUST have a circuit thru them(contacts closed)to get 12v to coil of sol.Also check that area where sol mounting bracket is free of rust/dirt & mounting bolts tight,check between battery pos(+) & sol bracket with a voltmeter/test light for 12v.

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05-21-2014 04:43:25

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
Use a test light follow wire and see where you loose the voltage at!

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El Toro

05-21-2014 04:27:10

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
Is there a pedal used to ground the solenoid? Hal

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05-21-2014 16:52:27

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 Re: Cub Cadet 108 in reply to El Toro, 05-21-2014 04:27:10  
Yes, that's one of the safety switches. The other safety switch is on the PTO.

The clutch safety switch has been by-passed by the PO.

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05-20-2014 20:34:48

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 Re: Cub Cadet 108 in reply to jb9959, 05-20-2014 19:56:15  
Yes, you can run a wire from the ignition switch to the start terminal, but... That will bypass the safety switches. Your tractor, your call.

Looking at the wiring diagram, there are only 2 safety switches, the PTO switch and the neutral/brake switch depending on which transmission. Might recheck the switches and wiring. Look for corroded connectors, high resistance in the switches, pinched or damaged wire.

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