I came across a Ram document describing a magic handshake that possibly would put a Promaster into "Ship Mode". I don't know if the document is up to date, or if it applies to cargo vans. The mode is intended to protect against parasitic draw. I'm not sure if the instructions shown will turn on the mode as when it is off, or just cancel the factory magic.
http://www.ramtrucks.com/assets/bbg/...cs/vf/ship.pdf
"ProMaster Ship Mode
ProMasters as shipped from our assembly plant will be in ship mode. This mode disables multiple electrical components to minimize battery drain during shipping and storage. For more detail on which features are disabled, See ship mode feature function chart on page 2.
The tell tale that the vehicle is in ship mode is a flashing battery light in the cluster. There is one condition where the battery lamp will be on all of the time in ship mode. See ship mode charging status table on page 2.
To reconfigure the vehicle to customer mode, follow the instructions below.
• Key OFF
• Headlights OFF
• Key ON
• Right turn signal ON
• Pull multifunction lever all the way to High Beam position (past “flash-to-pass”), and hold for more than 10 seconds."
The next page describes what features get turned off, and there are quite a few.