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JD 4100 Compact Won't hold charge

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PostPosted: Sat Nov 03, 2018 5:45 am    Post subject: JD 4100 Compact Won't hold charge Reply to specific post Reply with quote

I need some help in determining what & why my 4100 compact won't hold a charge.
I have been fighting this problem for quite awhile.
The strangest problem with it is that is a somewhat sporadic problem.
I've cleaned the battery terminals, I've replaced the entire cables.
Put a new battery in a few months ago.
After the new battery it would start perfectly....
For a week or two.
Then the tractor sat for a week or two.
Went out one morning, totally dead, the gauge lights didn't even come on.
I noticed one time when trying to get it started that it kind of clicked when turning the key, sometimes it would click, next time, nothing.
I replaced the key switch.
Slow charged the battery all day.
I had 12.50 volts at the battery.
Naturally it started right up.
I left sit for a while at an idle.
About 30 minutes went by, put my meter on the battery posts. It was showing 12.3 to 12.4 volts running...
Next morning, about 12 hrs. it fired right up.
The second morning about 36 hrs after the new switch & charged battery, it clicked a little, dash lights came on, but wouldn't even try to turn over.
I'll be taking the battery to be tested on Monday.
If the test shows the battery is good...
What is my next move?
Many thanks,
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Joined: 07 May 2020
Posts: 149

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PostPosted: Sat Jun 27, 2020 8:16 am    Post subject: Re: JD 4100 Compact Won''t hold charge Reply to specific post Reply with quote

sounds to me that the alternator is bad , should put out more voltage than that, at least 13 something, also probably current drain from the alt, charge up battery , then disconnect the alt, completely. you can do a current drawdown test with a test light, on the alt, and other things , (starter, relays, etc.), do you have an external regulator. mark55
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