Mep806a where is the mpu?

[SandBar]

I have tried to trace the 2 wires off the generator controller (16 and 17) to the mpu and I can't find it for the life of me. Can someone please show me a photo of where the mpu is on a mep806? And what it looks like? I am stumped.

 

[kloppk]

 

[SandBar]

THANK YOU!
I found item 13 many times, what is that?
My issue is generator starts great, then never makes power (fails to flash field I suppose). Taking out the MPU, cleaning and reinstalling is the correct course?
How on earth do people get to the MPU? I can barely reach item 13.

PS I have your auto start unit still waiting to install till I can fix this issue. With the generator running what should I see at the two MPU leads? 30v?

 

[kloppk]

TM 9-6115-645-24 See Section 2-110 Magnetic Pickup
Has testing and adjustment procedure.

 

[SandBar]

Ok no ohms and only 0.2 volts ac when cranking.

 

[kloppk]

No ohms as in almost 0?
If so the MPU may be mechanically damaged. Need to remove and inspect the tip of it.
They gen damaged if they come in contact with the flywheel.

 

[SandBar]

It says the sensor is here, not here. I'm so confused.

 

[SandBar]

No ohms as in almost 0?
If so the MPU may be mechanically damaged. Need to remove and inspect the tip of it.
They gen damaged if they come in contact with the flywheel.

As in reading 0 ohms and no continuity.

 

[SandBar]

I'm not calling that diagram a liar but that view above is looking over the generator head from the air filter access panel and you can see item 13 dead ahead and nothing in between.

 

[kloppk]

It should be screwed into the bell housing where the flywheel would be inside.
I can only go by the TM. Never wrenched on an 806.
Maybe someone can chime in with a pic or location description

 

[SandBar]

Im all over this thing and can't see where it can be hiding. The negative of having a nice enclosure on a generator. Hopefully someone can shed some light on its location.

 

[kloppk]

If you can locate connector P6 the wire for the MPU run from there to the MPU.
The wire is a 2 conductor shielded wire so it will appear as a single "wire" from P6.
Unfortunately there are 5 wire sets like that running from P6 to various places.

 

[SandBar]

Big reveal time. He is MISSING

 

[kloppk]

That would explain things

 

[SandBar]

I think I have a similar hall sensor in my parts bin

 

[SandBar]

Ok new Hal sensor in. I start and hold it to start and the hz come up! But after i let off start the hz fall back to 0. What does that indicate ? When this happens volts goes down and Under Voltage lights up on the fault indicator panel.

 

[kloppk]

I assume you adjusted the new sensor per the TM.

Besides Hz working with S1 in START what AC voltage is shown on the sets AC voltmeter and what position is the AM/VM switch in?
What position is the voltage reconnection board in?

Now you may be faced with a voltage regulator problem. Need to test the VR per the -24 TM.

 

[SandBar]

Am vm is set to l1-l2 (facing down and to the left), with s1 held to start I am seeing 150ish volts till I let off start.

 

[SandBar]

When I let off s1 volts fall to 25

 

[SandBar]

If the MPU tests at the bottom of the spec (2 volts ac on dead crank) will that cause this system?