- 463
- 262
- 63
- Location
- Seville, OH
Well, back OT... while my new fan clutch hose is being made.
I removed the PCU from the truck to find it dusty but no sign of oil etc. Removing the cover revealed a pristine unit.
![20180806_120130.jpg 20180806_120130.jpg](https://www.steelsoldiers.com/data/attachments/505/505353-1b65a5e50086b521ce2a18e3b5ff8263.jpg)
Proceeded to test the solenoids but was a little confused at the markings in the plug not matching the schematic.
![20180806_121655.jpg 20180806_121655.jpg](https://www.steelsoldiers.com/data/attachments/505/505354-bcde2d0315977a36ef07bafee08c232f.jpg)
The schematic has no pin C
![Screenshot_20180806-130427_Drive.jpg Screenshot_20180806-130427_Drive.jpg](https://www.steelsoldiers.com/data/attachments/505/505355-739196837d551b5588a21b9a7c49022c.jpg)
So using a meter, needle and a jumper wire, I penetrated the insulation on each wire to verify which was which.
This is what I found....
![20180806_131939.jpg 20180806_131939.jpg](https://www.steelsoldiers.com/data/attachments/505/505357-57da15a4a0ff5da4b14ebef3bb6bc71c.jpg)
The D', F', E' being the unmarked wire from the solenoid.
Now, that doesn't match the schematic either, which shows the ground connecting A and B, while the inside of the connector clearly shows F/A as the common pin.
It appears for sure that the control solenoid is OK, even though per the schematic the D' wire should be on pin A.
There seems to be a short inside the potted plug in order for Supply and Deflate both to be on the same pins.
So none of this makes sense. Do I have the wrong schematic? How do wires in a potted plug even short to each other??
I removed the PCU from the truck to find it dusty but no sign of oil etc. Removing the cover revealed a pristine unit.
![20180806_120130.jpg 20180806_120130.jpg](https://www.steelsoldiers.com/data/attachments/505/505353-1b65a5e50086b521ce2a18e3b5ff8263.jpg)
Proceeded to test the solenoids but was a little confused at the markings in the plug not matching the schematic.
![20180806_121655.jpg 20180806_121655.jpg](https://www.steelsoldiers.com/data/attachments/505/505354-bcde2d0315977a36ef07bafee08c232f.jpg)
The schematic has no pin C
![Screenshot_20180806-130427_Drive.jpg Screenshot_20180806-130427_Drive.jpg](https://www.steelsoldiers.com/data/attachments/505/505355-739196837d551b5588a21b9a7c49022c.jpg)
So using a meter, needle and a jumper wire, I penetrated the insulation on each wire to verify which was which.
This is what I found....
![20180806_131939.jpg 20180806_131939.jpg](https://www.steelsoldiers.com/data/attachments/505/505357-57da15a4a0ff5da4b14ebef3bb6bc71c.jpg)
The D', F', E' being the unmarked wire from the solenoid.
Now, that doesn't match the schematic either, which shows the ground connecting A and B, while the inside of the connector clearly shows F/A as the common pin.
It appears for sure that the control solenoid is OK, even though per the schematic the D' wire should be on pin A.
There seems to be a short inside the potted plug in order for Supply and Deflate both to be on the same pins.
So none of this makes sense. Do I have the wrong schematic? How do wires in a potted plug even short to each other??