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Mf 7 Not Charging


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#1 powerstroker00 OFFLINE  

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Posted July 21, 2013 - 08:43 PM

my father in law bought a mf7 at our last show and we just realized that it is not charging. I don't know much about the massey on the charging system. can anyone give me some pointers??
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#2 superaben OFFLINE  

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Posted July 21, 2013 - 08:58 PM

You will need to check whether you get power coming out of the engine first.  Since I'm not a Massey guy, what engine do you have?  Tecumseh?

 

Ben W.


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#3 powerstroker00 OFFLINE  

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Posted July 21, 2013 - 09:00 PM

You will need to check whether you get power coming out of the engine first.  Since I'm not a Massey guy, what engine do you have?  Tecumseh?
 
Ben W.

yes, it has a Tecumseh.
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#4 JDBrian OFFLINE  

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Posted July 22, 2013 - 04:49 AM

HM70 I think. I have an mf8 and I think electrically they are the same. There is a 3 prong connector coming out from behind the flywheel. The 2 outside wires are the coil. You should have a low resistance between them and AC voltage when the engine is running. The voltage regulator is mounted inside the console. It can be defective and if you have enough AC going into this box and no charging current then it's likely the problem. Check all the connections at the regulator as well. They can be a source of problems in a no charge situation. Check our Manuals section for a service manual for the 7. 


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#5 superaben OFFLINE  

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Posted July 22, 2013 - 06:17 AM

Brian is the man today.  Do keep in mind that stators rarely go bad.  Check for a bruised or broken wire before shredding the engine to buy an expensive part.

 

Ben W.


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#6 powerstroker00 OFFLINE  

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Posted July 22, 2013 - 07:47 AM

thanks for the info. I will see what ive got sometime today.
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#7 chiefgoodman OFFLINE  

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Posted July 22, 2013 - 01:19 PM

I just had to have my stator rebuilt by Dale Colvert. Mind you I have a 12. Good luck
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#8 powerstroker00 OFFLINE  

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Posted July 22, 2013 - 04:07 PM

I just had to have my stator rebuilt by Dale Colvert. Mind you I have a 12. Good luck

just got done looking at the 7, and best I can tell the stater is bad. I only have like 8 volts ac at the plug. according to the manual that means its bad. also the middle wire on the plug has been cut. does anyone know what that one is for??

#9 MH81 OFFLINE  

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Posted July 22, 2013 - 07:46 PM

just got done looking at the 7, and best I can tell the stater is bad. I only have like 8 volts ac at the plug. according to the manual that means its bad. also the middle wire on the plug has been cut. does anyone know what that one is for??

I think the third wire is a kill wire? Was it repaired or bypassed?

The 8vac is that a measurement from the two going to the stator as per the manual or from one pin to ground?

#10 powerstroker00 OFFLINE  

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Posted July 23, 2013 - 09:44 AM

I think the third wire is a kill wire? Was it repaired or bypassed?

The 8vac is that a measurement from the two going to the stator as per the manual or from one pin to ground?

the third wire is cut into. and the 8vac reading is per manual, from pin to pin.
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#11 MH81 OFFLINE  

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Posted July 23, 2013 - 12:03 PM

the third wire is cut into.

Must not be clear thru if the key shuts it off.

 

As for the charge, I would verify good ground at the regulator (Known for loosing it) and then if still no joy, i would pull the flywheel off to investigate.


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#12 chiefgoodman OFFLINE  

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Posted July 24, 2013 - 08:25 PM

It could be a short but I doubt it. The green wire is a kill. I'm not sure what the VAC would be on the 7.


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#13 IamSherwood OFFLINE  

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Posted July 24, 2013 - 08:33 PM

Where you running hi RPMs when you got that 8vac?


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#14 powerstroker00 OFFLINE  

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Posted July 25, 2013 - 03:22 PM

Where you running hi RPMs when you got that 8vac?

yes, running at "WOT" (WIDE OPEN THROTTLE)
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#15 IamSherwood OFFLINE  

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Posted July 25, 2013 - 07:14 PM

So, maybe just a good cleaning of the stator, might make a difference.

Worth a try.






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