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Massey Harris & Massey Ferguson Tractors Discussion Forum
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alternator 16+ vdc

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KnottyDan

03-04-2008 13:53:48




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I replaced the voltage regulator on my MF165 because I wasn't getting power to the battery, but now I'm getting 16 vdc and it seems to be going up. The battery charged overnight on a charger beforehand and tested good, so I was surprised to be getting so much voltage and after running the tractor for 5 minutes the voltage was even a bit higher than 16 vdc. The new voltage regulator has a cover secured with rivets which implies to me that it's not adjustabe, but the old DelcoRemy regulator it replaced was adjustable. Do you think I can adjust the new regulator or is that the wrong approach? Would you consider this normal voltage and will go down if I run the tractor longer? I measured the amps at the b+ terminal of the alternator and it was between 4-5A. Am I going to fry the new regulator?

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KnottyDan

03-05-2008 14:38:46




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 Re: alternator 16+ vdc FIXED FIXED in reply to KnottyDan, 03-04-2008 13:53:48  
I appreciate everyone's help. I just wanted to let you know I fixed the problem. If anyone is having the same problem here's how I solved it. First the old Delco regulator had many adjustables built into it and the new replacement did not, in fact it was riveted shut. I drilled out the rivets and opened the regulator and while the tractor was running I noticed that the coil was not regulating(flipping on and off rapidly). I deduced the spring was too strong for the electromagnet to overcome so I was going to put the old spring from the Delco regulator in the new regulator but they were not even similar, so I bent the spring's mounting tab on the new regulator just a hair towards the other end to loosen the spring's tension and the regulator started regulating a little. It brought the 16vdc I was getting from the alternator down to 15, so I bent it just a hair more and it started working even better and the voltage was now at 14.5vdc and that was fine with me. Thanks again to Hal and Joe and Gerald.

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Gerald J.

03-05-2008 16:59:31




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 Re: alternator 16+ vdc FIXED FIXED in reply to KnottyDan, 03-05-2008 14:38:46  
I'd prefer 14.2 volts. You want the charging current to taper to zero eventually. It won't at 14.5 volts.

I had to make that adjustment to what looked like a new generator regulator that was on my MF-135 when I got it about 20 years ago. Its been fine ever since. I get good battery life and running an electric sprayer pump half a day at a time hasn't burned anything up yet.

Gerald J.



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KnottyDan

03-05-2008 13:00:35




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
I feel the same way Gerald. The regulator definitely is not regulating, but I need to find the reason, especially now that I drilled out the rivets and ytmag.com probably will not exchange it. It seems like the regulating coil is not generating a strong enough magnetic field to overcome the spring's tension on the contact arm. The distance from the electromagnet to the contact arm doesn't appear to be adjustable, but maybe I can stretch out the spring. I measured the voltage from the end of the coil wire to ground and it was 8.4vdc when the battery was a 15.8vdc.

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Gerald J.

03-05-2008 17:01:18




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-05-2008 13:00:35  
There's a resistor in the coil circuit probably mounted under the regulator base.

Most of the adjustments are only by bending unless its a very old regulator.

Gerald J.



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Gerald J.

03-05-2008 12:35:38




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
I think the new regulator is not regulating and will fry the battery. I know charging at 16.5 volts WILL FRY the battery and possibly the alternator in the process. Be certain the regulator is grounded solidly. Then look for another new regulator.

Gerald J.



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KnottyDan

03-05-2008 11:20:26




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
I cleaned the grounds like Hal suggested and tried running the tractor and again the voltage started at 14vdc and started to slowly rise. So I decided to drill out the rivets on the new regulator to see if a coil was burned out or something. Dispite looking the same as the old DelcoRemy regulator from the outside it was a little bit different on the inside. It seems like they switched the location of the two coils. The coils looked fine, so I ran the tractor again and when the voltage went above 15vdc I checked the voltage at terminal#3 (I think thats the input voltage) and it matched the high voltage I was getting at the battery(over 15vdc). However the coils in the regulator were not breaking the circuit(they were not chattering back and forth at all). One coil closes when the tractor is started and stays latched until a few seconds after the engine is shutdown and then releases. I think that's probably normal. The other coil should be switching rapidly back and forth and it was not doing that. I did see it move once when the volts reached 15.5vdc, but just once, and the volt just kept climbing. Anyone out there have an idea on the possible causes.

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KnottyDan

03-05-2008 09:15:18




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
Yes Joe, I had one of those analog Battery/charging system testers hooked up to the battery while I had the tractor running and double checked it with my digital meter and they both matched. I'll clean the grounds today like Hal said but I'm thinking that it could be a bad connection between the rotor coil and regulator or maybe there's a way to adjust the regulator.



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Joe Ferguson

03-05-2008 07:42:56




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
Hi

Did you check the voltage with a digital meter ?
Sometimes digital meters will give erratic reading
due to different reasons too long to explain....

it is recommended to check voltage with engine running with an analog meter (one with a needle)
and one that the accuracy is known.

My 2�

Joe Ferguson



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El Toro

03-04-2008 16:51:19




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
You should have charging voltage at the battery around 14.5 volts and your charging amps should
be less when the battery is fully charged. I think you should clean all your ground connections
to see if this is the problem. Your regulator is probably the culprit since the charging voltage shouldn't exceed 14.5 volts even if the battery is low. The ampereage will be greater until the battery is charged and then the charging amps should drop off. Hal

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El Toro

03-04-2008 16:51:02




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
You should have charging voltage at the battery around 14.5 volts and your charging amps should
be less when the battery is fully charged. I think you should clean all your ground connections
to see if this is the problem. Your regulator is probably the culprit since the charging voltage shouldn't exceed 14.5 volts even if the battery is low. The ampereage will be greater until the battery is charged and then the charging amps should drop off. Hal

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El Toro

03-04-2008 16:50:49




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 Re: alternator 16+ vdc in reply to KnottyDan, 03-04-2008 13:53:48  
You should have charging voltage at the battery around 14.5 volts and your charging amps should
be less when the battery is fully charged. I think you should clean all your ground connections
to see if this is the problem. Your regulator is probably the culprit since the charging voltage shouldn't exceed 14.5 volts even if the battery is low. The ampereage will be greater until the battery is charged and then the charging amps should drop off. Hal

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