Regulator testing question

EB1019

New member

Equipment
B3200HSD/LA504/RCK60
Jan 15, 2026
2
0
1
Ohio
B3200HSD: I think I have a bad regulator (battery not charging, but dynamo is producing voltage). I found the chart below in the service manual, but am not 100% sure how to read it. I have a meter with a diode test function. When I connect it to "1 and 6", "3 and 6", and "5 and 2" I get a reading, everything other connection combination comes up "OL". Based on the black dots and lines in the chart, I assume that these indicate where I should get a reading. So by not getting a reading between "1 and 5" or "5 and 3", I assume the regulator is bad. But before dropping $200+, I was hoping to get a little more information first.

All help is greatly appreciated.

EB.
page9s18.png
 

TheOldHokie

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Lifetime Member

Equipment
L3901/LA525, G2160/RCK60, G2460/RCK60
Apr 6, 2021
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Myersville, MD
windyridgefarm.us
B3200HSD: I think I have a bad regulator (battery not charging, but dynamo is producing voltage). I found the chart below in the service manual, but am not 100% sure how to read it. I have a meter with a diode test function. When I connect it to "1 and 6", "3 and 6", and "5 and 2" I get a reading, everything other connection combination comes up "OL". Based on the black dots and lines in the chart, I assume that these indicate where I should get a reading. So by not getting a reading between "1 and 5" or "5 and 3", I assume the regulator is bad. But before dropping $200+, I was hoping to get a little more information first.

All help is greatly appreciated.

EB.
View attachment 168405
Put the meter dowm and step away from the regulator. Aftermarket for $25

 
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EB1019

New member

Equipment
B3200HSD/LA504/RCK60
Jan 15, 2026
2
0
1
Ohio
I saw the aftermarket ones on places like eBay, but wasn't sure if I could trust them. (I am in the appliance business and there are good aftermarket parts websites and some that aren't.) Thanks for the help!
 

bird dogger

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Vendor Member

Equipment
Kubota B2650 and lots of other equipment
Feb 24, 2019
1,747
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North Dakota
B3200HSD: I think I have a bad regulator (battery not charging, but dynamo is producing voltage). I found the chart below in the service manual, but am not 100% sure how to read it. I have a meter with a diode test function. When I connect it to "1 and 6", "3 and 6", and "5 and 2" I get a reading, everything other connection combination comes up "OL". Based on the black dots and lines in the chart, I assume that these indicate where I should get a reading. So by not getting a reading between "1 and 5" or "5 and 3", I assume the regulator is bad. But before dropping $200+, I was hoping to get a little more information first.

All help is greatly appreciated.

EB.
View attachment 168405
Your tester has two leads.... red and black? Typically, the red lead is plugged into the + terminal of your tester. The black lead would be plugged into the - terminal. It doesn't really matter but you need to know which lead is which; + or -. It also appears to say to set your tester on the highest resistance setting (ohms) possible. It doesn't mention the "diode test" setting, but that may work also. Try the following with both the Ohms and Diode test selected.

The chart also tells you which wire (by the colors noted) should be in the numbered position on the plug end as is also shown to the left of the chart.

Notice the upper left corner of the chart tells you that the top horizontal #s are for the + (red) tester lead placement. The left hand vertical #s are for the - (black) lead placement.

You have six tests for each column in the chart. Start with the red lead clipped to Terminal 1. The black lead also placed on 1 should of course give you a reading (it will test your meter connections are working). Proceeding down the first row with the black lead on #2 will give no reading. Black lead on #3 = no reading. Black lead on #4 = no reading. Black lead on #5 = positive reading. Black lead on #6 = no reading.

Movethe red tester lead to #2 and place the black lead on #s 1 thru 6 and the chart shows you should have a reading on #s 2 & 5.

Continue each set of tests with the red lead on the remaining #s and the black lead on all the terminal #s for each red lead # placement. Note which terminals should give you a reading for each of those tests.
 
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