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Sears lawn tractor model #917.273811 6 month old battery keeps going dead i put a volt meter on cables at full throtle only reads 12.66 dont change at low throtle any thoughts on what is happening thanks george

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Sounds like your voltage regulator may be bad. Voltage at full throttle should be around 13-14v to properly charge the battery.

Posted on Sep 09, 2009

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After assuring battery is charged and all electrical connections are clean and tight, you can try this,
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Can alternator put out 14.2 volts but not enough amps to charge battery and turn off dattery light?


Yes and no.
It sounds like you have a wiring problem.
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get a DC volt meter and check voltage at battery post before starting tractor
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Its either a voltage regulator problem or a stator (located under flywheel) problem.
Stator produces AC voltage to regulator so you need to set your volt meter to AC ,most stators have a plug exposed insert red and black lead of meter into each side of plug, you should read around 23 to 26 volts AC if no reading stator is opened (bad). The PTO clutch requires a full 12 volts to stay engaged. you could have a bad battery bad cell .have seen new batteries be bad.

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1 Answer

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Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12 volts or better after charging.
3. Make sure all connections are clean and tight especially the negative cable at both ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor. Good luck

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**Help** I have a Sears Craftsman 18hp Briggs/Stratton riding tractor, about 10 years old. Just put a new battery in last week. Went to start this morning and battery was dead. The red cable that goes to...


Yes it very well could be the starter solenoid, with a digital volt/ ohm meter and the battery disconnected place the positive lead on the positive test lead . With the meter on ohms take the negative lead and touch the frame or engine . This will confirm weather or not you have a short to frame. If the meter reads 0.00 disconnect the starter from the system by removing the positive and ignition wires from th starter . Now individualy test each wire removed from the starter in the same process as above if ohm meter read ol ( over limit) the starter would be the best place to start. If the meter reads 0.00 would suggest there are other issues in the circuit and the starter may not be at fault.

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Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12 volts or better after charging.
3. Make sure all connections are clean and tight especially the negative cable at both ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v replace battery.
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6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
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