Voltage Regulator for Yanmar YM3000

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wricwo
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Voltage Regulator for Yanmar YM3000

Postby wricwo » Thu Feb 15, 2018 6:48 pm

The voltage regulator went bad so I replaced it with a mechanical one that I had for a YM330. It plugged in with no problems - six spade plug. When I cranked the tractor, the charge light stayed lit and the voltage supplied to the battery was 16 volts at idle. I assume that the YM330 regulator won’t work with the YM3000.

winston
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Re: Voltage Regulator for Yanmar YM3000

Postby winston » Fri Feb 16, 2018 5:38 am

This sight shows the same regulator for both tractors.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Fri Feb 16, 2018 7:24 am

I was thinking the same thing. The old regulator was definitely shot- rusted outside to inside from where the previous owner kept the tractor outside in the elements uncovered. Wonder what could be the problem then because I measured the voltage at idle to be 15.8 volts and with it idled up a bit, it was up at a little over 17 volts. The charge light stayed on the entire time.

Norm
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Re: Voltage Regulator for Yanmar YM3000

Postby Norm » Fri Feb 16, 2018 10:17 am

Check the points on the mechanical regulator.

alan
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Re: Voltage Regulator for Yanmar YM3000

Postby alan » Fri Feb 16, 2018 11:34 am

wric: The original regs seem to have a design life of around 25 years but often can be repaired. The new solid-state ones are not designed to be repaired but to outlast the tractor.

Winston: You have good eye-site.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Fri Feb 16, 2018 2:54 pm

I opened up the mechanical regulator and points look good - it’s practically brand new/ never used. I also cross referenced the part numbers and it is a replacement for the old one that was on it. I did a load test on the battery and it showed bad. I’m going to check out the old alternator as well.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Fri Feb 16, 2018 3:02 pm

Also when I hook up my battery positive, one set of contact points pull up/click without the key switched on. When I turn on the ignition switch, the charge light comes on and stays on. I never did see the second set of contact points pull up.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Fri Feb 16, 2018 7:18 pm

I went ahead and repaired the old regulator (soldered back two connections that were rusted into). I hooked it up and cranked tractor. Charge light comes on and stays lit, but no charge to battery at various speed ranges. Alternator doesn’t seem to be charging now and lights/turn signals won’t work.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Sun Feb 18, 2018 12:28 am

Had alternator tested and it was only putting out 11.25 volts. So I’m going ahead and changing it too.

Norm
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Re: Voltage Regulator for Yanmar YM3000

Postby Norm » Sun Feb 18, 2018 10:02 am

What happened to the 15.8 v and 17 v you had previously? It's very unusual for both to be bad. How was the alternator checked?

alan
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Re: Voltage Regulator for Yanmar YM3000

Postby alan » Sun Feb 18, 2018 12:08 pm

Yanmar alternators seem to last the life of the tractor.

If you want to forget having the tractor charge the battery, use it just for starting, then turn the key back off. (No lights or horn, but so what.) After every few runs, hook up a charger or tender.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Sun Feb 18, 2018 6:02 pm

The higher voltage readings were being produced when I had the new regulator on it. I believe it wasn’t the correct one so I took it off and repaired the old one. The new one plugged up correctly, but each spade was wired differently. The A, E, F, N, L, IGN were all different. I took the alternator to O’Reilly auto parts and they put it on a machine which showed the 11.25 volts. They went ahead and ordered a replacement. I also went back to the shop and took the alternator apart to clean it up. I checked rotor continuity according to the factory manual and it ohmed too high. Also, the rectifier tested bad on one of its continuity test. I’ll update when the replacement comes in tomorrow and I get it back all back together.

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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Mon Feb 19, 2018 7:13 pm

Well I installed the new (remanufactured) alternator and it is showing only 12.46 volts at idle and at 1500 rpm.

Norm
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Re: Voltage Regulator for Yanmar YM3000

Postby Norm » Tue Feb 20, 2018 9:27 am

wricwo wrote:The higher voltage readings were being produced when I had the new regulator on it. I believe it wasn’t the correct one so I took it off and repaired the old one. The new one plugged up correctly, but each spade was wired differently. The A, E, F, N, L, IGN were all different. I took the alternator to O’Reilly auto parts and they put it on a machine which showed the 11.25 volts. They went ahead and ordered a replacement. I also went back to the shop and took the alternator apart to clean it up. I checked rotor continuity according to the factory manual and it ohmed too high. Also, the rectifier tested bad on one of its continuity test. I’ll update when the replacement comes in tomorrow and I get it back all back together.

I would suspect O'rielly's testing. If the alt. still puts out 17vdc, (reg. can't raise the output), it's good.

wricwo
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Re: Voltage Regulator for Yanmar YM3000

Postby wricwo » Sat Feb 24, 2018 8:36 pm

Got it back going. Pulled the fuse box out and gave it a good cleaning. Then plugged everything back up and now it’s charging. Headlights and turn signals work. Thanks again everyone.

Bill


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