I would recommend spending some time reading the wiring diagrams in your ford service manual and try to make some sense of them.
Automotive electrical diagrams are usually drawn a little differently than what you will see anywhere else and each manufacturer does theirs a bit uniquely.
My Jeep XJ diagrams are drawn a bit different than my Toyota FZJ diagrams and they're different than the ford diagrams.
Try to familiarize yourself with the diagrams for your vehicle.
They include very important information such as wire colors and sizes (this is especially helpful in large bundles of wires if you know what size to look for before you start trying to identify each color and tracer). They also include all the connectors in the vehicle and shown their location. This is extremely helpful when trying to trouble shoot because you can isolate and test separate sections of the circuits if you know where to look to unplug them.
For wiring that is added by others, you often need to be really keen and try to solve HOW they want the circuit to work before you can even try to troubleshoot it.
Simple multimeter functionality is key. If you know how to check voltage (and its polarity) and also check for continuity, you're on a good start.
You could always pick a simple circuit on your van and try to identify all the wires and connectors in that circuit as an exercise if you're bored
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