If you're not getting 12V when connecting your voltmeter to pins # 1 (ground) and #4 (Aux 12V), then either the wire to #4 pin is not connected, or if it is you may have a blown (or missing) fuse or a bad relay.
This is the power distribution center, located under the hood on the driver's side of the E450. In the below picture, 4 is the relay for power to the #4 pin, and 17 is the 50 amp fuse feeding that relay.
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Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
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