current isn't getting to the starter on Cub Cadet RZT50

   / current isn't getting to the starter on Cub Cadet RZT50 #1  

Morven39

New member
Joined
Aug 17, 2017
Messages
11
Location
Quitman, Ga
Tractor
Cub Cadet RZT50
I replaced the dead battery on my Cub Cadet RZT 50 with a Battery Source 480CCA but when I turn the key to crank it up, no cranking. The parking brake is set, the left and right turn levers are fully forward and outward depressing the switches, PTO switch is OFF and seat is fully down. The current is getting to the little red lights on the left side because if I don't have the parking brake set, that red light comes on. Any help appreciated on what to start checking. .
 
   / current isn't getting to the starter on Cub Cadet RZT50 #2  
Check for voltages from ignition switch along path to solenoid to see if there is voltage to energize solenoid.... IF you short across solenoid terminal does it crank?..

Trouble shooting is a step by step progressive procedure in which you have to verify every safety switch or component in sequence is working properly....

This is where wiring diagram and a volt-ohm meter or test light comes in handy....

This is my favorite tool for trouble shooting 12 volt non computer systems...

2700449466_e6f5ee4e56_o.jpg


Dale
 
   / current isn't getting to the starter on Cub Cadet RZT50 #3  
I replaced the dead battery on my Cub Cadet RZT 50 with a Battery Source 480CCA but when I turn the key to crank it up, no cranking. The parking brake is set, the left and right turn levers are fully forward and outward depressing the switches, PTO switch is OFF and seat is fully down. The current is getting to the little red lights on the left side because if I don't have the parking brake set, that red light comes on. Any help appreciated on what to start checking. .

the starter circuit is battery powers the starting switch which powers the solenoid on the starter which then feeds battery power to the starter.

So to bypass all the above so that you can just check the starter itself, leave the negative lead to the battery as it is - I'm assuming it is clean and good connection to the tractor frame.

Now look down at the bellhousing at the combo starter motor and piggyback starter solenoid. You are looking for a heavy wire or flat plate connection going from the solenoid to the single terminal on the starter motor itself. There is usually only that one connection to the starter because the other side of the starter circuit is the motor block and frame itself ... and all the other wires are going to the solenoid.

Now take a heavy jumper cable and attach one end to the + side of battery. Take the other end and briefly touch that terminal on the starter. If you can't figure out which one, it is OK to touch any of the two heavy connections on the solenoid or the one on the starter motor. But when you get it right, be ready for a big spark and be careful because if the starter is good it will rotate REGARDLESS of any safety features in the whole rest of the tractor. Make sure it was out of gear because what we are doing can the tractor to move if in gear and maybe start for a moment.

If the starter woke up and responded by turning, the starter is good. First thing I would do is replace the starter solenoid. They are cheap and a 30 minute job. If that doesn't fix it, backtrack up to the ignition switch and then back to the + terminal of the battery though the safety switches to find where the current is being blocked.
Good luck,
rScotty
 
   / current isn't getting to the starter on Cub Cadet RZT50 #4  
Easiest way to test the starter is take an open ended wrench and short the big terminals on the starter solenoid (or relay if you prefer), I did that for a long time on my old mower before I put a push button on the starter circuit to bypass the whole interrupt setup...

The solenoids normally have a single small wire sticking out that is the ground or two spade terminals on the side, if you put power to one and ground to the other (doesn't matter which way) the solenoid should switch the starter on, a test light will help isolate which isn't working... If you put power and ground across the solenoid control side and it clicks but the starter doesn't work, the solenoid is bad.
 
   / current isn't getting to the starter on Cub Cadet RZT50 #5  
One by one bypass each safety switch till you find the one that is sticking. Then replace it
 
   / current isn't getting to the starter on Cub Cadet RZT50
  • Thread Starter
#6  
Thanks to rScotty and all who tried to help me. Thanks for the info. I didn't have enough room to try the use open ended wrench, so I hooked the the positive charger cable to the positive battery terminal and touched the other end to the connection with the only terminal that I I could see on the starter solenoid where it has a red wire attached. I got a spark but didn't hear a click. The starter didn't make any sound as far as I could tell. If I have followed the instructions correctly, does that mean the starter is bad or the solenoid is bad or something else?

I am in my 80s and definitely not a mechanic, but hoped that this would be something that I would be able to repair with help.
 
   / current isn't getting to the starter on Cub Cadet RZT50 #7  
Thanks to rScotty and all who tried to help me. Thanks for the info. I didn't have enough room to try the use open ended wrench, so I hooked the the positive charger cable to the positive battery terminal and touched the other end to the connection with the only terminal that I I could see on the starter solenoid where it has a red wire attached. I got a spark but didn't hear a click. The starter didn't make any sound as far as I could tell. If I have followed the instructions correctly, does that mean the starter is bad or the solenoid is bad or something else?

I am in my 80s and definitely not a mechanic, but hoped that this would be something that I would be able to repair with help.

Hmmmm..... I'm assuming that the battery is hooked up in the normal fashion with the negative terminal going to the frame. Better check that before we go any farther.

So I'm still assuming here that the battery is hooked up right with negative to frame (ground). It sure would help to see a photo of that solenoid and starter to decide where to touch it. But we can probaly figure it out. Glad you went with the cable instead of the wrench trick. That trick works and we all do it, but like a lot of quick and dirty old mechanic tricks there is a big chance of BIG sparks and melted metal the first time you try it.

Most piggyback solenoids have one (rarely two) small terminals, and two larger terminals.

The small terminal gets the signal from the starter button to activate the solenoid. If you put power in the form of a cable from the battery + to that terminal, then the solenoid should makes a "clacking" sound as it becomes an electromagnet and moves contacts inside the solenoid.

Of the two larger heavy battery cable sized terminals on the solenoid, one goes back to the positive of the battery, and the other goes to the starter.

Normally when the solenoid is activated what is happening as it clacks is it is simply throwing a copper bar across those those two heavy terminals where they stick inside the case. It is shorting them together. Those are the same heavy battery cable size terminals that someone said you can access to short with a wrench to make the starter turn. Basically that is what the solenoid does. It shorts those terminals inside a can to protect you from the spartks. Or - more safely - you could jump directly from the battery with the positive battery cable like you did. Touching one of those terminals shouldn't change anything, touching the other should make the starter turn.

The common problem with the solenoid is that that copper bar that is getting thrown by the solenoid to short those two terminals gets old and corroded so it won't carry the current to turn the starter anymore. But even if the copper bar needs cleaning the solenoid normally will make an "clack" sound.

Since yours didn't, we don't know what is wrong, but it is getting close to time to disconnect the starter, remove it, and take it to an auto electric shop to for one or two simple tests - but that's only if you have an auto electric shop with a guy who knows what he is doing. The new all-purpose shops just try to sell you things. ... but you know that.

Alternately if we can dig up a photo or picture of a Cub Cadet RZT50 starter/solenoid combo so I can be more definite about which terminals to touch and a couple of more simple tests to do.

Has anyone got a good drawing or photo of that Cub Cadet RZT50 starter & solenoid?
luck,
rScotty
 
   / current isn't getting to the starter on Cub Cadet RZT50 #8  
Hmmmm..... I'm assuming that the battery is hooked up in the normal fashion with the negative terminal going to the frame. Better check that before we go any farther.

So I'm still assuming here that the battery is hooked up right with negative to frame (ground). It sure would help to see a photo of that solenoid and starter to decide where to touch it. But we can probaly figure it out. Glad you went with the cable instead of the wrench trick. That trick works and we all do it, but like a lot of quick and dirty old mechanic tricks there is a big chance of BIG sparks and melted metal the first time you try it.

Most piggyback solenoids have one (rarely two) small terminals, and two larger terminals.

The small terminal gets the signal from the starter button to activate the solenoid. If you put power in the form of a cable from the battery + to that terminal, then the solenoid should makes a "clacking" sound as it becomes an electromagnet and moves contacts inside the solenoid.

Of the two larger heavy battery cable sized terminals on the solenoid, one goes back to the positive of the battery, and the other goes to the starter.

Normally when the solenoid is activated what is happening as it clacks is it is simply throwing a copper bar across those those two heavy terminals where they stick inside the case. It is shorting them together. Those are the same heavy battery cable size terminals that someone said you can access to short with a wrench to make the starter turn. Basically that is what the solenoid does. It shorts those terminals inside a can to protect you from the spartks. Or - more safely - you could jump directly from the battery with the positive battery cable like you did. Touching one of those terminals shouldn't change anything, touching the other should make the starter turn.

The common problem with the solenoid is that that copper bar that is getting thrown by the solenoid to short those two terminals gets old and corroded so it won't carry the current to turn the starter anymore. But even if the copper bar needs cleaning the solenoid normally will make an "clack" sound.

Since yours didn't, we don't know what is wrong, but it is getting close to time to disconnect the starter, remove it, and take it to an auto electric shop to for one or two simple tests - but that's only if you have an auto electric shop with a guy who knows what he is doing. The new all-purpose shops just try to sell you things. ... but you know that.

Alternately if we can dig up a photo or picture of a Cub Cadet RZT50 starter/solenoid combo so I can be more definite about which terminals to touch and a couple of more simple tests to do.

Has anyone got a good drawing or photo of that Cub Cadet RZT50 starter & solenoid?
luck,
rScotty

Read what rScotty has to say....

This should be you starter solenoid.....

s-l300.jpg

(image unceremoniously ripped from GOOGLE IMAGES)

Putting 12 volt (+ from battery) to small screw terminal should energize solenoid and close main contacts (large screw terminals)to put power to starter .... People have been known to short across the two main terminals to get starter to spin, this bypasses every safety feature and safe procedure know to small engine work.....

One main termial of solenoid it should go to stud on starter, the other main terminal should go back to positive (+) post on battery....

Dale
 
Last edited:
   / current isn't getting to the starter on Cub Cadet RZT50 #9  
Read what Scotty has to say....

This should be you starter solenoid.....

s-l300.jpg


Putting 12 volt (+ from battery) to small screw terminal should energize solenoid and close main contacts (large screw terminals)to put power to starter .... People have been known to short across the two main terminal to get starter to spin, this bypasses every safety feature and procedure know to small engine work.....

ON one main termial of solenoid it should go to stud on starter, the other main terminal should go back to positive (+) post on battery....

Dale

Right. I'm thinking as Dale is that this starter has a remote solenoid rather than a piggybacked one.

Does this look like your starter?

If so, if it is any good, then touching the positive cable to that single exposed terminal should make it turn regardless. If it doesn't you need to replace it - or at least open it up and figure out what's wrong inside. Sometimes it is simple.

Oh... and very rarely, it can happen that the starter has stopped in exactly the wrong position, and if you bang on it and can turn it just a smidge it will work again. Worth a try if you get it out. You can test it on the bench - but hold it down - by hooking battery negative to the case and touching positive to the terminal.

I see that starter on Ebay for $80.

rScotty
 

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