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TC10284

520H Possibly not charging?

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I have a 1991 41-20OE02 520-H.

I started it up yesterday to let it run a bit. Noticed the voltmeter was showing in the red. Yet it turned over fine and ran fine. 

Let it idle for about 10min before revving it up. Voltmeter stayed the same whether it was at idle or wide open. Voltmeter appears to be working, as when you shut off the engine, the gauge drops down to below 10v like it should. 

 

Connected a voltmeter to the battery terminals and I'm getting a solid 12.5 to 12.6v whether idling or wide open. 

Is there something wrong with my stator, or wiring? 

Any way to test to make sure it's charging and engine is not running entirely off the battery? 

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@TC10284 You should see a voltage around 13.6--14 VDC while the engine is running almost WOT.

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Didn't you download the manual for previous issues?  Here it is: manual

 

As KC9KAS said, voltage is too low if your voltmeter is correct.  Possibly voltage regulator, but do the tests.

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50 minutes ago, lynnmor said:

Didn't you download the manual for previous issues?  Here it is: manual

 

As KC9KAS said, voltage is too low if your voltmeter is correct.  Possibly voltage regulator, but do the tests.

 

Yep, I did. Sorry for asking a question that was probably already answered in that manual.

 

Didn't know if anyone had any other experiences with this issue is all. 

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On 1/10/2019 at 4:36 PM, lynnmor said:

Didn't you download the manual for previous issues?  Here it is: manual

 

As KC9KAS said, voltage is too low if your voltmeter is correct.  Possibly voltage regulator, but do the tests.

 

OK, I finally had some time (and weather nice enough) to run the tests. 

 

On the alternator output test, here are my results:

Test 1 - 12.5v battery

Test 2 - 11.97v to 12.04v

(Step 3 is checking connections and wiring)

Test 4:
15v at idle 1800rpm
44v at 3600rpm

 

Additionally, I swapped the regulator rectifier from another 520H and am seeing the same results. 

 

I did find one of the main red wires looks like it had a lot of resistance on it, and melted the plastic around it.

Pics are here:
https://photos.google.com/share/AF1QipMwYVSzPlpS-l_BBgJtB2wq0DxCXKHQYnA0EcOXphKgrDPuQF5D6jPEr5hoJXavwA?key=dTB0LTF4V084YU9FOXA3MnpaVXRwejBXY2l6SGNR

 

I'm at a loss at this point as to what could be causing it. 

Edited by TC10284

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That 9 pin connector is toast, temporarily jump a wire around the burnt connector and retest.  It might be possible to release the offending terminals and pull them out if they aren't melted too bad.  That connector is nothing but trouble for many folks, it isn't corrosion resistant and is something that belongs in the back of a TV.

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I had a problem like that on a different brand tractor, I just jumped around the bad plug. charges fine now

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27 minutes ago, lynnmor said:

That 9 pin connector is toast, temporarily jump a wire around the burnt connector and retest.  It might be possible to release the offending terminals and pull them out if they aren't melted too bad.  That connector is nothing but trouble for many folks, it isn't corrosion resistant and is something that belongs in the back of a TV.

 

I'll try that most likely tomorrow. I already have replacement connectors, so I guess I can go ahead and swap them out. 

 

I did use my voltmeter and connected the B+ on the regulator to the positive on the battery WITHOUT the redwire connected to the terminal and saw 12.79V. Although I don't recall the voltmeter changing to a more normal range. 

Edited by TC10284

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