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Alternator not working on L35 Kubota tractor

12 volt charging system is not working on my L35 Kubota tractor. I need to know how to test the alternator with the machine running, such as the field switch on the back of the alternator.

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Charging system failed. Why is new alternator output ranging between 11 1/2 and 12 1/2 volts?


11 1/2 to 12 1/2 is not charging . That's less then battery state of charge , Battery stat of charge should be 12.6 volts , when charging with a volt meter you should see 13.1 to 14.1 volt at the battery posts . Is there a battery symbol lit on your instrument cluster ? Is there battery B+ voltage at the wires hooked to the alternator How to Test an Alternator

Feb 18, 2016 | 2001 Kia Spectra

1 Answer

Need a wireing diagram for 149 cub cadet mower tractor it does not charge


The Battery Won't Charge or stay charged.
Several possibilities
  1. Key switch doesn't turn off the system and the battery drains while it's parked.
  2. Bad insulation on the wiring somewhere and the battery drains down.
  3. The alternator is not putting out enough power or no power at all.
  4. The battery is bad.
Let's consider the battery first. This is an easy check if you have a cheap, simple volt meter. It's much better to have an old fashioned needle meter rather than a digital. The needle is more sensitive, much quicker, and makes a clearer diagnostic tool. But not to worry, for you fancy folks a digital still works (sometimes the results are not as easy to decipher).
  1. Set the meter to DC Volts.
  2. Attach the red and black leads of the meter to the positive and negative posts of the battery. Most modern day digital meters don't care if the polarity is correct or not. However, if you have a needle meter, best to put the positive of the battery with the red wire of the meter; otherwise the needle will not be happy with you.
  3. Note voltage. It should read near or above 13 volts if the battery is good and fully charged. If it reads below 12 volts the battery needs charged or it has bad cells. If after charging a few hours, the voltage is still below 12 volts then the cells are bad, replace it. That should solve your problem. If not...continue.
  4. "Load Test". Turn the key to crank the engine while keeping your eyes on the meter. Whether the engine cranks (turns over) or not, the meter should not fall much below 11 Volts. If it falls below 10 volts or worse yet below 9 volts, the battery has a bad cell or two. Replace the battery, charge it, and repeat the test.
  5. If the engine starts, rev it up and watch the meter.
    1. If the charging system is working the voltage on the meter should quickly rise above 13 volts.
    2. If it rises up strongly towards the 14 volt range this indicates the charging system of the machine is working.
    3. If it plays around down near 12 volts you are reading the recovered voltage of a good battery, but the charging system is not working.
    4. If it simply stays below 11 volts, the battery and the charging system are both suspect.
      1. Charge you battery.
      2. Repeat the test.If you get the same results...continue
      3. Replace the battery.
      4. Fully charge it,
      5. Repeat the tests before worrying about the charging system.
Note: if the battery falls below 9 volts the fuel cut off, a black cylinder on the bottom of the carburetor (if your model has this), will cut off the gas supply to the carburetor.

If the battery passes all the tests and you still don't get 13-14 volts of charge it's time to test the charging system.

Small engines have 3 different possible alternators, standard circuit, dual circuit, tri circuit. I would need the exact engine model numbers in order to precisely answer your question. Often mower models have choices for the engine they come with. In this situation the engine model is more important than the model of the mower.

Testing an alternator is fairly simple; all you need is the same multi-meter used for battery testing. Do take note: The settings for battery testing are DC Volts. The Settings for Stator or Alternator testing are AC Volts (in the 50 Volt range).
  1. Disconnect the connector from stator. The stator is right there on top of the engine under the plastic/metal fan guard. Take this off and look for a pigtail wire with a connector. Don't get the coil wire with the spark plug end.
  2. Set multi-meter for AC volts.
  3. Attach RED test lead to either pin on stator side of stator connector. (On single wire leads, attach RED test lead to the single pin.) On AC output alternators there is no positive or negative because both wires alternate from positive to negative, so either pin will do.
  4. On two wire lead models, attach Black test lead to the other pin. On single wire stator connectors attach the Black test lead to the engine or other ground.
  5. Prepare the lawn tractor for engine start (set parking brake). Start engine and run at full throttle.
  6. Check output. Output for engines of this general size run in the 30 to 50 volt range. For instance the B&S V twin 22 hp AC output at full throttle is 30 Volts minimum. Other B&S on these machines spec 40 Volt minimum.
If your voltages are not in the manufacturers range (too low), or non-existent, your stator is partly shorted or completely burnt out (open circuit). Either way you have to replace it.
A. In the picture is a single lead stator connector.
B .In the picture is a two wire lead stator connector.
25588487-nduycjuiiqtqizufokyqk0fw-3-0.jpg

Mar 18, 2015 | Cub Cadet Garden

1 Answer

My tractor will not start unless I charge the batteries.


You need a qualified technician pronto. You will wreck your wiring and possibly the alternator. These things can be very tricky.

Sep 28, 2014 | Garden

1 Answer

Bike won't rev out


Could be electrical.Bikes that have generator systems need battery induced.Unlike an alternator system,like a car you can jump start and the alternator will run with good spark to fire fuel.Generator type need battery induced,so battery must have correct amperage.Can test battery with a volt or/amp test.See what you have with bike not running,then running need about 20% more volts then the 6 or 12 volt battery states (about 14 volts running on a 12 volt battery.Know your battery life span & know that a new battery that year.Plus generator must keep battery charged.I like to have a good spare and also go for a glass mat battery especially if bike is ridden season related. Good Luck!

May 17, 2014 | 2002 Honda CMX 250 Rebel

1 Answer

How do you know if a tractor has been converted to 12volt system


A 12 volt system will have an alternator instead of a generator, a 12 volt ignition coil, and most importantly a 12 volt battery.

May 10, 2014 | Ford 8N Tractor

1 Answer

Can I use a 8 volt battery on a 6 volt tractor or will it trip the voltage regulator and blcck the generator?


YOU CAN USE AN 8 VOLT BATTERY, IT SHOULDN'T HURT ANYTHING. THE ONLY THING IS IT WON'T STAY FULLY CHARGED. THE GENERATOR IS DESIGNED FOR A 6 VOLT BATTERY NOT 8 VOLTS. WHAT I DO IS CHANGE THE SYSTEM TO 12 VOLTS. NOTHING WILL HAVE TO BE DONE TO THE STARTER, IF THE TRACTOR STARTS LIKE IT IS SUPPOSED TO. IT WILL JUST START FASTER. YOU WILL NEED NEW POINTS & CONDENSER & A RESISTOR FOR THE DISTRIBUTOR. ALSO A 12 VOLT BATTERY & A MID 1970'S INTERNALLY REGULATED ALTERNATOR, MOUNTED IN PLACE OF THE GENERATOR. THIS A LITTLE WORK BUT THE TRACTOR WILL START AMAZINGLY FAST. I HAVE DONE THIS SEVERAL TIMES & IT WORKS GREAT. IF THE FUEL GAUGE STILL WORKS YOU WILL NEED A SPECIAL RESISTOR FOR THAT. OF COURSE ANY LIGHTS WILL HAVE TO BE CHANGED TO 12 VOLT GOOD LUCK. DR. VOLT.

Jan 25, 2011 | Ford Expedition Cars & Trucks

1 Answer

Wont keep a charge


Hi,

You should be able to get over 12 volts from the charging system of the lawnmower. I would think once it is running, you should get 12.8 to just over 13 volts dc to adequately charge your battery. If you have less then 12 v power output from your chargiing system, well then the charging system is not working properly.

Of course, if the battery is defective and wont hold a charge, you can test that be taking the battery out of the machine and checking the voltage. It should be 12 volts or slightly better. If you let it sit overnight and it drops substantially, well it is likely not holding a charge and draining internally. If it does not have 12 volts to begin with and your charging system is ok, well then it is likely defective.

Also, you can use the glass hydrometer made for batteries to draw up some fluiid and check against the colour scale.

Each cell on a battery is 2 volts, so 2 volts times 6 cells is 12 volts. So if one cell is bad, then they all become bad as the battery needs a total of 12 volts to operate.

Some gargages will test your battery for free if you buy the new battery from them.

Sep 21, 2009 | Briggs & Stratton Garden

1 Answer

I installed a new battery in my B6200 Kubota tractor. the tractor sat for 2 years, so I don;t if the charge light worked then or not. Now the charge light won't go out


check the voltage at the battery when its running if its charging below 13.5 volts then you have a bad alternator or charging system not working properly

Jun 05, 2009 | Garden

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