Cub Cadet 128 starting issues
 

When I hook up the battery, the s/g starts cranking over, disconnect battery and it stops, also noticed that the amp gauge pegs to discharged side while it's cranking. I have replaced Ign switch, solenoid, and voltage regulator. I'm at a loss.

Sounds like something isn't wired correctly, here's a link to the wiring diagrams. I suggest you start by double checking it's wired correctly.

https://www.onlycubcadets.net/forum/showthread.php?t=22

Agreed,

Also, Are you sure you got the correct ignition switch ? Is it an aftermarket switch?

Let's back up.....
Since you say that as soon as you hook the battery up, it starts cranking. That means previously, you had the battery hooked up and it didn't do this. What was the original problem that you set out to fix?

More than likely you wired the v-reg incorrectly when you hooked it up.

What Jmench said.
You may have the newer type of vr that has the gen terminal on the bottom, so let us know what type you have.

Or you have stuck contacts inside the V/R. All speculation until we have more info:bigthink:

I also will go along with the V/R isn't wired correctly.

Cub Cadet 128 starting issues
 

I am not sure if it's a new style, will look at it again tonight. When it's cranking I have battery voltage at the yellow wire at the s/g ??? The tractor has not ran since I purchased it this spring, the engine was bad so I replaced it. PO said it used to run but smoked. I have gone over the wiring with an ohm meter and load tested the wiring with a test light, all checked OK. Been a automotive tech for 40 years, the last 26 years at a GMC/ Buick dealership so wiring is not a problem for me. My thoughts are a stuck v/r. Will look into again tonight and triple check wiring diagram.

Well then I would have surely thought you could figure this out. Pretty simple system. If you suspect(ed) a stuck V/R, unhook it and see if it still does it.

Are you using OEM Cub Cadet parts or Aftermarket...???

:bigthink:

I agree with all posters above.
some of the newer regulators while having the same terminal location, are not hooked to the same internal parts.
Sooo you have to make sure the terminal on the reg is marked,
then that you have connected them to the correct wires.
Don't just go by where reg. terminals are located physically.
"B" to batt.
"G" to Gen or armature "A" terminal(can be stamped either on Starter/Gen.)
(G is not ground)
"F" to field (Smallest terminal on starter/generator)
Well you get the pix,
And like working on vehicles, you never know what the last well meaning "mechanic" did or hooked up incorrectly.
Assume nothing.:beerchug:
Let us know what you find.
(It's normal for amp gauge to show heavy discharge while cranking)

Definitely sounds like voltage regulator not being wired properly, or having a stuck cutout relay in the VR. I think both of those things will cause what you describe.

Also, be aware that some of the off-brand VRs are set for like 14.7 volts from the factory, which to me is a little hot. You can adjust them by changing the spring tension on the field coil in the VR (tighter = higher voltage, less tight = lower voltage). Also, I believe the original VRs regulated on both current and voltage, while the newer ones seem to be just voltage.

Cu Cadet 128 starting issues
 

V/R , took a known good one off another cub, stuck it on and all is good. Was headed that direction but not sure. Came on here for assistance and a 2nd opinion. Thanks all for your help !!

Does that mean it was a stuck VR or was it miss wired?

Cu Cadet 128 starting issues
 

A stuck voltage regulator, it was wired up correctly

Really curious as to how it gets stuck after being removed from another tractor with no power to it. Then engages itself and becomes stuck when powered up again. Just seems odd.

Not saying I dont believe it.. Just never seen a new one get stuck on first try.

My guess is it was wired wrong.

:beerchug:

Cu Cadet 128 starting issues
 

Nothing better then dealing with guys who know it all !!!!!!!

I dont know it all. But I know brand new coils dont just get stuck. It takes more than just hooking up the VR correctly to make it fail.

I've not replaced hundreds of these like some guys here but i have replaced 4 in the last 18 months and repaired an original one. I get how they work.

Edit.. Lol and Jmech really gets how they work.

I believe you wrencher. :beerchug: glad it’s fixed as that’s what’s important

Cu Cadet 128 starting issues
 

Thank you Alvy, I just told it how it happened. I deal with electrical situations all the time at my job. But they are all electronic modules and such. Came on here for assistance and got basically called a liar. I put in a request to the moderator to be taken off here. Will find assistance else where if ever needed again.

Uh yEither way it seems the assistance here put you on the correct track.
Seems odd to be asked to be taken off of a forum. You cant be forced to log into it

I did not call you a liar. But I numbered the reasons I say what you found are suspect.

1. You didnt know what you had.
2. You didnt know where power should be during cranking.
3. You can't test load with a test light.
4. All of the above tells me wiring is an issue for you.

Im sorry if you think I was calling you a liar but from the above mentioned statements I doubt you were lying. I think you just didnt understand what was happening.

It's one thing to be great at what you do but it's another to be great at what you do and feel the need to shove it down everyone's throat that may be less experienced. :beatdeadhorse:

Not sure if this was pointed at me.. It seems you might have. I been a mechanic 30 plus years. This guy was claiming to be a mechanic for 40 plus years. I take a little offense to someone saying they have that much experience when they say they tested load with a test light but then also say electrical after being a tech for so long is no problem for them. Then in the next breath they say " I deal with electrical situations all the time at my job. But they are all electronic modules and such". Well, body control modules, trans modules, and all late model vehicle car modules are way way more technical than a cub VR.. I am sorry.. Just callin it like I see it. I like helping people. Im sure others here do also. After others here helped the guy, the least he could have done is said "thanks guys, you were right, I messed up the wiring because the new VR was a little different"

I think Roland should add a time out section and let those sent to it to paint the walls with their eye balls...

He already has that....
I'd like to see someone other than me get put in it.....:RollEyes2:

Personally I don’t like J and Coop on the same side.
They might turn on us. Best to keep them just against each other. :biggrin2:

That is because 95% of the complaints I get...... are about YOU.

Coop is beginning to sound like J-Mech's understudy.

You guys need to chill and not be so accusatory--regardless of your experience, knowledge or tight underwear binding down there.

Unlike some places in society, you are innocent until...well you are always innocent. Unless and until you admit a mistake. Which you are under no obligation to ever do. It is the internet, after all!

Wrench, don't go away. Most of us are nice. :beerchug:

Understudy? No. Wrencher made a pretty tall claim. 40 years. 26 in same shop. Even after 30 years I make mistakes still. When I do I admit I did. And BTW. I have been on both sides of this. I have taken a lot of crap from Jon and from others backing Jon up. Also. There have been plenty of times I agree with Jon. I didn't always agree with how he talked to people but in this case wrencher kind of opened the door I feel. I will leave wrencher alone and I am sorry for being a little rough on him. This was no rougher than Jon or others have been on me a dozen times or more tho...whatever.

This is entertaining. :popcorn:

Frank...... I'm a little disappointed.

Thanks for the reset Frank... it's needed.

This place is every bit as much for shade tree weekend mechanics, first time Cub owners, as lifer wrench turners. For Gods sake let's try and welcome people, encourage them, help them (us) learn from mistakes and become part of the forum.