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#1
11-01-2020, 07:55 PM
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Cub 128 Starting Issues
Hello all,
I bought a Cub 128 from the original owner a few years back. It came with several implements and I have used it to mow my yard and work my garden. I've replaced several parts and kept it running well, but I have an issue now that I need some help with. The tractor just recently stopped starting. Here are the conditions: turning the key, the starter turned the engine over just fine but engine wouldn't run. I replaced the spark plug as I was not getting spark at the plug. No luck. I checked the points and noticed I wasn't getting spark there even after cleaning them. I checked the coil using a meter and got 5 ohms resistance. So good coil. I then checked the positive terminal of the coil with the switch on and I am not getting juice there. Battery is good. Voltage regulator looks good. Wires seem ok. Last thing, I ran a jumper wire from the positive post on the battery to the positive terminal on the coil and then turned the key and she fired right up. Do I have a bad switch? Just wanted some opinions before I got spending $50 on a switch. Thanks! 
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#2
11-01-2020, 08:00 PM
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That sounds like a bad switch to me, unless the wire from it to the coil is bad somewhere. It could be, but assuming the wiring is good like you say it is, don't think there's anything else that can cause that thing to happen.
I say, replace the switch, if it isn't the issue, well, at least you've saved yourself from having to replace it later 
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 '70 107 with k301 engine swap '71 106 with 38" deck '70 147R with factory replacement k321, 42" deck '61 Original with 38" timed deck '63 70 "pinkie" 1863 with 54" deck '46 Farmall H, '50 Farmall Cub 105 x2 (parts)
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#3
11-01-2020, 09:18 PM
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You need to back track from where you have no voltage. Keep going back until you find the volts... The farthest you can go is all the way back to battery. It's really not that far. It could be after the switch or before the switch. I won't buy a new switch unless I'm certain switch is bad. I'm not familiar with the 128 wiring but there could be a safety switch long the way of the electrical path from battery to coil. (Seat? PTO?). Or a wire could be bad.
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Two 125's and a 124 all with 42" decks Plow blade #2 Cart QA36 snowthower
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#4
11-01-2020, 10:01 PM
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Quote:
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'70 107 with k301 engine swap '71 106 with 38" deck '70 147R with factory replacement k321, 42" deck '61 Original with 38" timed deck '63 70 "pinkie" 1863 with 54" deck '46 Farmall H, '50 Farmall Cub 105 x2 (parts)
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#5
11-02-2020, 07:11 AM
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First, welcome to OCC.....
 I agree with the others. It is either the Ignition Switch or a broken wire in that circuit.
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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#6
11-02-2020, 10:20 AM
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Thank you for all the suggestions! I do have trouble with the safety switch on the clutch sometimes, but when it acts up, the starter won't turn over. Since the starter is turning, I hopefully have ruled out that switch, but I'll give it a look since it sometimes causes issues. I don't believe I have any other safety switches, but I'll do a little research. I've traced the battery to coil wires the best I can and haven't seen any worn spots. I think I'm going to try the ignition switch and see if that fixes it. If not, looks like I will probably have to run new wire. One thing I forgot to mention is that the ignition switch is original and is pretty worn. I can crank the tractor with a screwdriver in place of a key lol.
I'll come back and update the thread if the switch works just in case anyone needs it in the future. Thank you all for having such a great community!
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#8
11-02-2020, 06:50 PM
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Quote:
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Up to 533 and counting... I give up updating my profile!
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#9
11-07-2020, 11:05 AM
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Just to update everyone. I received a new switch and she cranks right up now. Thank you for all the help and for these forums. If it wasn't for this place, I wouldn't have known where to start looking. I was born after points ignition systems were obsolete so I had to take a crash course on the ignition system lol!
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