Diagostic help please - battery discharges while cutting.

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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Hi,

I have a Scag Cheetah with a Briggs and Stratton engine. When I've been cutting for a few hours and I stop the engine I often find that the battery does not have enough power to crank the engine to restart. I've taken to putting the battery on charge when I finish. I see the amp meter registering +2V while idling but when I engage the PTO it drops to -2V - I presume the amp meter should be registering positive volts at all time.

Does the amp meter reading point to any particular fault?

Cheers, Peter
 
I

ILENGINE

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  • / Diagostic help please - battery discharges while cutting.
How about providing the complete model number from the engine so we can see which engine that you have.
 
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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Hi,

Firstly, thanks for the reply.

The engine is:
810cc Commercial Turf
Model 48L977
Type 0126G5
Code 121018YG
Serial No 12 1017 YG 76652

The Scag is:
SCZ52V-28BS - SCAG CHEETAH, 52" VELOCITY DECK with 28HP Briggs

Domestic use (6 acres of lawn). Currently 540 hours on the clock.

Cheers, Peter
 
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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Hi,

Thanks for that although, while it's obvioulsy very comprehensive, it looks like a daunting read! Given the amp meter reading any recomendation as to where I should start the diagnosis process?

Cheers, Peter
 
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Rivets

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  • / Diagostic help please - battery discharges while cutting.
Start by first identifying which charging system you have, look at the color of wires and connectors you have on your engine. Then test the voltage regulator and stator according to the appropriate procedure. This will tell you if the charging system is working properly. Disregard you Amp meter at this time and post what you find.
 
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Luffydog

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  • / Diagostic help please - battery discharges while cutting.
Crank it up check the charging see what you have. Then leave your meter on and then pull pto and check to see what you have. If it's not charging look under the key switch panel and look to see if you have a yellow wire that might be burnt. If it is charging and you pull the pto the discharges might be look at a bad clutch.
 
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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Lufftydog/Rivits,

Thanks for the feedback. Hopefully I will be able to get to the Scag this afternoon (I'm in Adelaide, Australia) and will report back asap.

Cheers, Peter
 
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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Hi Luftydog,

Starting with battery fully charged:

12.95 at rest, PTO disengaged.

13.6 runing, PTO disengaged.

12.5 running, PTO engaged.

12.3 at rest, PTO engaged.

The yellow wire looks ok.

Cheers, Peter
 
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PeterJones

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  • / Diagostic help please - battery discharges while cutting.
Hi Rivits,

My wiring is 10 or 16 amp regulated (page 16) of the pdf.

However, it is not clear to me where I can find "test the voltage regulator and stator according to the appropriate procedure" in the pdf. Could you point me to page number?

Luftydog - in rereading my early post I may not have been clear: by "at rest" I simply mean engine off. by "running" I mean egine on.

Cheers, Peter
 
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