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Cub IS Charging?

E

equeen

Member
Well, the idea of "trickle charge" got me to a-wonderin'.

So, I checked the volts across the battery posts at 6.25 on the little cub.

Then I drove her up to the store for some gas and expanded the drive a bit for a total of over half a mile.

I checked the volts across the battery posts at 6.31 after I parked her about .

Sooooo, I'm going to get the mower deck cleaned up and back on her and do some mowing next week. Will see if I can drain the battery. Hope not.

Next task will be lights on her.
 
What's the voltage when running? That'll tell more, shoul be 7v or more.
Remember too it'll take awhile to replace the power drained from starting. A couple starts with no running will run the battery down if its not real good.
 
Issue with Cutout, then VR?

I'm totally baffled with this. Voltage readings across battery posts with engine running have never registered more than 6.31. Ammeter barely above 0. So, I "gave up" and decided to run the tractor and see if I could drain the battery.

With two starts and a nice 1/2 mile + trip, the battery was more charged (6.31 as I recall), than it was when I fired it up (6.25 I believe).

I have yet to see a 6.4 or above reading across the posts with the engine running.

Still baffled; but the charge is coming from somewhere. I'm hoping it will continue.
 
I understand your points; but I'm not getting that voltage.

The battery is less than 6 months old and was temporarily taken from a well-running tractor. It charges fine with a regular battery charger.

I expected the battery to be somewhat drained after two starts and the trip - but had more volts than when I started. So, it was getting juice - maybe just enough of a trickle to do the job.
 
I forget, is the generator a known quantity? Seems like that'd be the place to look if its not known good.
 
Im glad you got some help here, sounds to me like your voltmeter accuracy is surely lacking.

John T
 
Volt/ohm meter accuracy? Hmmm?

Good point. Maybe I need to borrow one for a double-check.

I did change the batteries in the meter and I do get 6.3 when battery fully charged. Hmmm?

Maybe it's my old eyes???? Hmmm?
 
Charging voltage is going to depend on the condition of the battery. As long as the voltage is higher than what the battery reads when the engine is turned off, it will charge. (Maybe not fast, as there are other variables, but it will charge.)
 
You really need to check the voltage with the engine running. A fully charged battery, when put under a large load like cranking the engine, will have a lower voltage right after the load is taken off. Then it will slowly recover some or most of the lost voltage. That may be the effect that you are seeing. In order for the battery to be recharged it needs at least a half a volt above the full charge voltage. Anything less than about 6.8 volts in not going to recharge the battery.
 
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