E 350 Upfitter Relay Connector

[Sdpaddlebum]

I'm trying to find the under-dash connection for the Upfitter Relay/Upfitter switches in a 2013 Ford E350.

Lots of videos showing pickups, but they didn't help.

The Body Builders Layout Book gives a schematic for the relay, but not the location.

If anybody has found that connector under the dash, I'd love to see pictures of where to find it.

TIA

[carringb]

It should be near the steering column. Probably taped to the adjacent wire harness. Rectangle 6-pin but only 4 pins are used. Very similar to the pre-09 trailer brake connector.