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Old 04-07-2013, 11:32 AM   #1
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Help Save this Battery


I have a 1994 MTD (Lowes) riding mower. 14 HP, 42" cut.

I bought a new battery yesterday and want to make sure everything is working well. The mower starts with ease.

I want to verify the battery is being charged when the mower is running.

I measured the voltage at the battery with the mower off and on.
The voltage difference was minimal.

Is this because the battery is at full charge?

I was looking for a couple more volts while running?

I want to make sure the battery will serve me well and the mower is indeed providing a sufficient charge.

Thanks John

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Old 04-07-2013, 12:49 PM   #2
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Help Save this Battery


Ayuh,.... The battery voltage should show 'bout 12 volts sittin', 'n 'bout 13.6 volts with the motor runnin', if it's chargin'...

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Old 04-07-2013, 01:39 PM   #3
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Quote:
Originally Posted by Bondo View Post
Ayuh,.... The battery voltage should show 'bout 12 volts sittin', 'n 'bout 13.6 volts with the motor runnin', if it's chargin'...
I got almost 13 VDC sitting and 13.8 VDC running.

Seems a fully charged new battery would not see a large difference in voltage as the battery is already charged fully.

Lets take this one step further.
I have located the connector that has two wires coming from under the flywheel. These are the wires that charge the battery.
A yellow goes to the line side of the solenoid, (direct shot to positive battery terminal) the white I am not sure where it goes but I can find out.

If I were to disconnect this connector and put a meter across these two charging wires with the engine running, what voltage should I be reading?
This would be a "no battery" reading. Directly from the motors charging output wires.
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Old 04-07-2013, 01:59 PM   #4
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Help Save this Battery


Put a load on the battery for a few seconds by cranking it 10 seconds with the ignition switch off then repeat for another 10 seconds after waiting about a minute . Now check the differential voltage again . You'll probably like that difference better and quit worrying about things that don't need to be worried about .
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Old 04-07-2013, 03:39 PM   #5
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If it when up nearly 1 volt from not running to running, it's likely charging. There is nothing else to make the voltage go up...
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Old 04-07-2013, 04:23 PM   #6
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Quote:
Originally Posted by Bondo View Post
'bout 12 volts sittin'
Thats what I thought too, so I looked it up in Wikipedia, and a charged lead-acid battery will actually make 12.6 v sitting (2.105 volts per cell)

If the voltage while running is more than that, power will flow into the battery and charge it up. I think you are fine.
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Old 04-07-2013, 06:34 PM   #7
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Quote:
Originally Posted by J. V. View Post
I got almost 13 VDC sitting and 13.8 VDC running.

Seems a fully charged new battery would not see a large difference in voltage as the battery is already charged fully.

Lets take this one step further.
I have located the connector that has two wires coming from under the flywheel. These are the wires that charge the battery.
A yellow goes to the line side of the solenoid, (direct shot to positive battery terminal) the white I am not sure where it goes but I can find out.

If I were to disconnect this connector and put a meter across these two charging wires with the engine running, what voltage should I be reading?
This would be a "no battery" reading. Directly from the motors charging output wires.
It is charging.....if not, then the run voltage would be the same or slightly less. Your over thinking this....go cut the grass.
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Old 04-12-2013, 03:22 PM   #8
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Pick up a can of CRC QD contact cleaner, unplug all your electrical connection plugs and spray and wire brush them spray again and plug back in. A lot of crap gets in those plugs over time.

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Last edited by jagans; 04-26-2013 at 09:29 AM.
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