2320 charge indicator light

[cannonfodder666]

I have recently found that my 2013 2320 HST stops charging if the charge indicator light is burnt out. If this is true its sounds like a real flaw in engineering. If true where is the bulb and its type and number and how is it replaced. Thanks for any insight.

 

[pmsmechanic]

This method has been used to turn alternators on since they were developed. That's why you check your alternator light when you turn the key on first thing. If it doesn't work then the bulb is burnt out and the alternator won't get turned on.

The light works by being fed two positive currents. One from the key and one from the alternator. With the key on but not the engine the light glows because the alternator is not charging and the wire is a ground. Once the alternator is charging the wire turns to positive and the light goes out indicating that the alternator is charging.

I don't know for others but on a GM alternator all you need to do is momentarily touch the wire going to a light to a positive and the alternator is turned on.

 

[cannonfodder666]

I guess I realized that from old Chevy trucks I had but thought that 40 or 50 yrs later they would be self energizing. Plus it has 108 hrs on it. Short bulb life? I guess no big deal once I find the bulb and know what it takes. I'll get two when I replace it. Thanks.

 

[cannonfodder666]

Tore my dash all apart to access bulb.Bulb is not burned out but no power to it on either side. Any idea what causes this. is the regulator faulty or what??? I have oil pressure and glow plug lights and I can see the battery light by shining the flash light in the back with the bulb out. It is the third one down on the left just under the oil pressure light. So light is never on either key on and not running or when running. What gives? I guess this is beyond my capacity.

 

[pmsmechanic]

I could be wrong but to me the year and the hours should make this a warranty job. Some newer vehicles and tractors the alternator is turned on by the computer.

 

[Dave M7040]

I did a little searching and found that your tractor has a Yanmar 3TNV76 diesel engine with a 20 amp output dynamo not an alternator.
The difference is that an alternator uses an electric current to produce a magnetic field and then rotates coils of wire through the field to produce electricity.
The dynamo has real magnets inside to produce a magnetic field and then rotates the magnets iinside fixed coils of wire to produce electricity.
It does not need any signal to turn it on like alternators do.
Quoting the shop manual: "The dynamo consists of a series of permanent magnets which rotate around a stationary stator coil. The magnets are attached to the flywheel (inside the dynamo) which is rotated via the engine cooling fan drive belt. The resultant output is an alternating current. The alternating current is converted to direct current by the current limiter. The current limiter outputs charging direct current to the battery."

I found a Yanmar shop manual at the following link:
http://www.martindiesel.com/Documents/New TNV-IDI Service.pdf
I think you have a Kokusan GP9191 dynamo rated for 12Volt dc 20 amps. I am giving you an educated guess based upon the info I can find on line.
Instead of a voltage regulator it has a current limiter which converts alternating current to direct current to charge the battery and operate lights etc.
In section 11 of the shop manual there is an excellent trouble shooting chart you should look at.
You have not answered the question "does the charge indicator bulb light up when the key is turned on."
I would expect that bulb failure is a remote possibility as it sees very little use lighting up for seconds before you start the engine.
Is it possible you have squirrels or other nesting somewhere in your engine compartment. They love chewing on wires.
On my Kubota they love being near the turbo and I almost had a fire when the nesting material began to smoke.
From a 2012 post on this form "My JD 950 was attacked my Rats, and now my wiring is a mess."
Do you have a way to check the battery voltage when the tractor is off and running?
Dave M7040

 

[cannonfodder666]

Dealer sent
pizza boy with replacement battery. Not even a voltmeter. Told us this model only charges at 12;6 volts.BS!! Battery is down to 11.8 volts after 2 hrs with lights on. Not impressed with the service.Guess I need a shop manual and fix it myself.Warrantee is worthless if the shop is manned by idiots.

 

[DFB]

I'm curious do you know if there might be a diode in the charging circuit? I seem to recall reading (I guess here on TBN) about JD adding diodes to electrical circuits on the newer models and some failures were because of a faulty diode. I don't know if the charging system loop was one of them though.


My 4100 has the same type of dynamo
I had a glow plug timer failure once drew a constant current and that created a no charge situation for me.

A shop manual with wiring diagrams and theory of operation descriptions is an invaluable resource to have indeed.