Transfer case

[WEST OZ H2]

OK, so I went out and put the trany case in 4H locked, whipped off the drive shaft and off I drove, , but.... it didn't last for long. I put my foot into it and...no go .

I put the drive shaft back on and off I went, but, I got the windup again, so then jacked both rear wheels off the ground, dropped it into D and sure enough, it tries to drive off the jacks. I changed between 4H and 4H locked, same same, I then dropped it into 4L Locked and back into 4h, all whille the wheels were off the ground. When I dropped it from 4L to 4H it was fine. The back wheels spun happily with out the vehicle going anywhere, all good. I dropped it back on the ground and on my first turn I got windup. I'm certain there is a problem with the lockup fork in the transfer case.

I can't work out which wires give it it's signal to actuate, any one know?

Cheers,
Al