Cub Cadet 108 Charging

jb9959 · Jul 3, 2017

I installed a new voltage regulator a few weeks ago. However, when I polarize the generator it will charge until the battery has a full charge. It will not show a charge after the battery is fully charged. When I stop the tractor and check the voltage of the battery it is only ~ 60%. That means when the generator charges the battery the ignition runs on the voltage from the battery. I can polarize the generator and it charges right up and then stops charging. Does this mean I may have a faulty voltage regulator?

jb9959

R Bedell · Jul 4, 2017

jb9959:

(A) What V/R did you install..??

(B) Is the Charging System wired correctly..??

Normally, polarizing the S/G is not necessary.

jb9959 · Jul 4, 2017

I bought one on eBay. Recommended for the CC 108.

When I touch the P terminal to a ground it pegs out and will stay that way for a few minutes. I read your post several months ago on trouble shooting CC starter/generators.

jb9959

T.R.K. · Jul 4, 2017

That approx. 60% has me confused. What kind of meter are using to measure that number?

The first 2 sentences indicate to me that the generator and regulator are working together properly. Its not like an alternator where the system voltage goes over 13.5 volts and stays there.

The regulator allows the generator to raise the system current to a level where it senses that the battery is being satisfactorily re-charged and there is enough current to supply the ignition system. When it senses that the battery has a satisfactory charge in it, then it allows generator current output to drop way back to where the ammeter may not even register any charge. If it would keep charging at the same rate of current, it will eventually boil all the water out of the battery.

R Bedell · Jul 5, 2017

jb9959:

I bought one on eBay. Recommended for the CC 108. When I touch the P terminal to a ground it pegs out

There are no "P" terminals on CC Voltage Regulators.

Here are the correct Voltage Regulators for Cub Cadets... [b:3300465a40][color=darkblue:3300465a40]CC V/R[/color:3300465a40][/b:3300465a40]

jb9959 · Jul 5, 2017

OOPS! Should be F to Ground.

R Bedell · Jul 6, 2017

jb9959:

Shorting the F terminal to Ground puts the S/G in full power (unregulated) mode. If it pegs the Amp Meter to the charge (+) side, then this indicates the S/G is doing it's job.

I would double check to see if the V/R is wired correctly and make sure that the mounting feet of the V/R is properly grounded. There should be zero ohms resistance between the V/R mounting and the Battery Negative Terminal.

dhermesc · Jul 6, 2017

I agree - everything appears to be functioning as it should. How are you measuring your battery at "60%"? If you are only getting 8 volts on a 12 volt battery most likely you battery is weak. If you are only getting 160 cranking amps on a 240 cranking amp battery again I would suspect a weak battery that won't accept a full charge.

jb9959 · Jul 7, 2017

I have a chart that lists a 12 volt battery as fully charged at 12.73 volts.

At 60% the reading will be ~ 12.37 volts.

Cub Cadet 108 Charging

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