Here’s a handy reference guide on how a harness is set up on a Espar / Eberspacher Airtronic S2 D2L heater.

Want to tap into your power terminal in your Sprinter Van? Under the driver seat you’ll see all the relays and wires that tap into the power coming from your battery. Here’s the diagrams for X145/1.

Quick Reference Guide to T1N Mercedes / Dodge / Freightliner Sprinter Van Wiring Reference Numbers