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Bill Cashin

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Dec 14, 2020
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Rebuilding a Cub Cadet 125. Basically replaced the electrical system and got it running last night but the battery is not charging. Where should I start?
 

digger

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Rebuilding a Cub Cadet 125. Basically replaced the electrical system and got it running last night but the battery is not charging. Where should I start?
Check the voltage coming out of the starter/generator at full throttle. If it's less than 14 volts, there's the problem. If its at that or above, then move on to the voltage regulator.
 

Bill Cashin

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Dec 14, 2020
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With the engine running about half speed I’m only getting under 1 volt from the F terminal with my meter. Red probe on F terminal and black probe to ground. Voltage regulator is brand new.
 

rfunk

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Reynold Funk
In the faq there's a whole testing breakdown on the starter-generator. Check the details, my memory isn't perfect, but briefly shorting the F terminal on the starter-generator to ground, at full throttle, should produce more than about 16-18 volts at the A terminal. If yes, wiring issue (old wires) if no, internal issue.
 
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