It was in the upper of the two harnesses on the bulkhead above the air filter if you pull back the outer sleave and check the thin black white wire for a break i think you will find your problem.
Vw t4 sliding door adjustment.
In this short video i not only swap over a vw t4 sliding door but i also cover how you can adjust the alignment of your sliding door if it does not line up from the outside or if you can see light.
The same principal is used for other vans like the.
If the door of your vw doesn t sit flush with the car body the door buffer needs adjustment.
This video explains how this works.
If the sliding door on your van is hard to open and close or if it feels like the door of your van is stuck when you open and close it you can fix the stuc.
Then swing open the door 45 degrees.
In this video i replace the middle roller of a vw t4 transporter see description for links to rollers.
Brief explanatory video of what to address to maintain a sliding door on a vw bay window bus.
This will rotate the rollers at the base and align them with the cutout in the lower track.