I bought my manuals on eBay. The original source was Helm Inc. And the manual has a phone #:
There are 3 thick manuals and a separate 'Wiring Diagrams' book for my van.
The Helm stuff is not cheap. But, it is worth it if you want to work on your own van.
SOLD04 EB350 Custom Floorplan
6.0 PSD 4.10 Posi
Salem Kroger coil spring 4wd
SMB Trailer w/AT Air Suspension
Alaska to Key West, Labrador and more
130685 miles 16.65 mpg average
Prostate cancer survivor. viewtopic.php?f=8&t=11099
2015 VW GTI
Leaving CA for WA
You can also purchase a full wiring diagram for the van as well from them. I have not bought one of these yet for my van but I purchased a factory service manual for my Jeep and they are way better than the Haynes or Chiltons manuals.