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J model electrical shop?

plumberpilot

By plumberpilot
in Modern Mooney Discussion

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plumberpilot Apprentice

plumberpilot

Posted
Posted

I would like to know if anyone has a recommendation for a shop that can track down and fix an electrical issue in a J model Mooney. We've been chasing one for too long and want it fixed. I'm willing to travel heck I've got a plane.

Andy95W Grand Master

Andy95W

Posted
Posted
2 hours ago, Yetti said:

 give us armatures a chance to figure it out for you?

Armatures-electrical problems- hilarious!

Or was it autocorrect?

plumberpilot Apprentice

plumberpilot

Posted
  • Author
Posted

I'm in VA, NJ is close enough. The latest is a brand new $1700.00 regulator fried after only 30 hrs no warranty and frankly I don't blame them. I need a top notch person to unearth our problem and up till now I haven't found them.

Thanks

Ricky

 

1964-M20E Grand Master

1964-M20E

Posted
Posted

wow $1,700 regulator that is outrageous, :o that aside let's get to the basics

 

1. how did the problem start?

2. what are the symptoms?

3. Connections have all battery and cable connections associated with the battery, master relay, starter solenoid been cleaned and checked?

4. Have all ground connections been cleaned and checked?

5. What are the readings from the volt meter and ammeter when the engine is running?

6. Where is the regulator located?

7.??

 

mooniac15u Veteran

mooniac15u

Posted
Posted

What year is your plane?  The M20J came with either a 14V system (early models) or 28V system (later models). Is it possible that a 14V component (alternator, battery, voltage regulator) was installed on a 28V system or vice versa?

N201MKTurbo Grand Master

N201MKTurbo

Posted
Posted
18 minutes ago, mooniac15u said:

What year is your plane?  The M20J came with either a 14V system (early models) or 28V system (later models). Is it possible that a 14V component (alternator, battery, voltage regulator) was installed on a 28V system or vice versa?

That's plausible....

If you put a 28V alternator on a 14V plane it would work OK with reduced current capability.

If you put a 14V alternator on a 28V plane the regulator would probably saturate full on trying to make the 28V, which could burn out the regulator.

plumberpilot Apprentice

plumberpilot

Posted
  • Author
Posted

It's a 1992 MSE 28V, agreed $1700.00 is higher than high that may have included the alternator too to be fair.The problems have been all over the map. Small things like the instrument light system problems, bigger things like autopilot problems seemingly related to power. Then the master breaker and regulator both burnt out together causing complete and immediate power failure all checked and replaced now regulator burnt out again. I'm not looking for possible causes as much as I'm looking for an expert to find and fix the root problem once and for all. There have been a couple of shops looking for the problem over the "YEARS" still we've got issues. 

Yetti Grand Master

Yetti

Posted
Posted

Floating ground or battery that has turned one of it's cells can cause all those problems.  Floating grounds can be cause by ground straps that don't really ground.   I would buy a bucket of ground straps and redo all the ones that are current and then do a couple extra. Like to the starter, alternator, then frame to engine.  Then battery to frame.  With the grounds not working as designed then grounds are sought through other paths that are not designed to handle the load.   I have a story about a radio antenna in a lightening prone zone and concrete.

 

carusoam Grand Master

carusoam

Posted
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Do you have access to the part numbers for the regulator and voltage controller that are on your plane? Do they match your log book?  What are the numbers?

Best regards,

-a-

 

1964-M20E Grand Master

1964-M20E

Posted
Posted

I agree with Yetti check grounds.  The basic charging and battery systems are not rocket science.  Once you get away from that yes it starts getting more complicated but still manageable with the schematic / wiring diagrams.

 

Find a shunt and hook up a temporary ammeter  at the alternator output and voltmeter separate from the installed gauges and see if the agree.

 

 

jclemens Community Regular

jclemens

Posted
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I can't troubleshoot your electrical problem online, but if you want to bring it to FL I am certain we can fix it.  The electrical system in a Mooney is pretty typical to most GA aircraft.  It's really not that complicated.  With a multimeter and a wiring diagram it's not that hard if you have a grasp of things.  I will say Mooney's idea of a wiring diagram is kind of tough on the eyes to look at.

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