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Old 07-30-2010, 11:24 AM   post #1 of 5
rsmith02184
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Default Another JD 4100 voltage regulator problem/question

Hi

I found a thread on this issue but I wasn't able to add to it for some reason. So, I started a new thread.

A few weeks ago the voltage regulator/rectifier started smoking and basically melted. I replaced it with a new one but the charging system still doesn't work. I tried to do all the electrical tests per the technical manual and I think I found out that the K7 safety relay is broken and possibly the V1 diode.

So here are my questions:

1) would a bad K7 safety relay prevent the regulator from charging the battery? (i thought it only protected the regulator from reverse polarity).

2) do you know where the V1 diode is on my tractor? I think I found the V2 diode but I can't find the V1.

3) a friend of mine said he tested the voltage coming out of the regulator and he said it measured 29V which seems like it is letting ALL of the volts that the alternator is producing get through. Does this mean that the new regulator I put in is already bad?

thanks in advance
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Old 08-03-2010, 01:11 PM   post #2 of 5
sween
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Default Re: Another JD 4100 voltage regulator problem/question

I have a JD 4100.The battery is not being charged unless I charge it from the bench. I read 29v coming direct from the alternator. Thats ac volts. If I read at the battery with the tractor running the voltage wont increase. I dont have a shop manual and wondered if and where the rectifer would be located.
TIA sween
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Old 08-03-2010, 03:41 PM   post #3 of 5
rsmith02184
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Default Re: Another JD 4100 voltage regulator problem/question

It is located under the shroud (kick panel) which is directly underneath the steering wheel. There are a number of screws running up each side of the shroud (10mm) and then there are 4 screws that connect the control panel (the dash) to the shroud.

Take off the shroud (take off the throttle level first to get the shroud off) and the regulator is on the right side. There are at least 8 wires going to it and it has fins to disipate the heat it generates.

It is unlikely your problem is with the regulator. It is more likely with one of your wires from your battery. they need to be really tight to make a good connection for the battery to charge. You can also check to make sure all of your ground connections are solid too.

Good luck. My problem had something to do with my negative cable being loose and the battery began to arc and it fried the regulator.
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Old 08-03-2010, 10:17 PM   post #4 of 5
sween
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Default Re: Another JD 4100 voltage regulator problem/question

Thanks for the reply. What part of Massachusets were you at? I was born in Adams. I now live in Greenville N Y and spend the winter near Tampa Fl.
I had the shroud off before to free up a sticky throttle. I'll check all the wires and clean the terminals. Thanks again for the help.
sween
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Old 08-04-2010, 01:35 PM   post #5 of 5
rsmith02184
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Default Re: Another JD 4100 voltage regulator problem/question

you're welcome. if you find out what the problem is...let me know. i am curious. this problem of mine with the battery not charging has been a real challenge for me to solve. I have the system charging correctly now but the battery discharge light is still on. When I feel like attacking it again, I will try and figure out why that light is staying on.

I used to live in Braintree. 20 miles south of boston. I am not sure where Adams is but I have heard of it.
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