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To me it sounds like a grounding issue or maybe a connection with corrosion / high resistance. When the engine is running there's enough voltage to "force" the issue. The issue could be in the trailer OR the truck.

Depending on what you mean by haywire, more likely the wiring. A bad ground, a short, a break or a crossed wire will give suboptimal results ;) The harness is simple enough. Also, zip tying on a generic harness from Hazard Freight will give you a cheap, temporary solution if you need the...

The stock 24v bulbs will work on a civilian 12v system. They will be slightly dimmer than they ought to be but they're plainly visible.

So I finally got off my butt and wired up a 4-way to milspec harness adapter. My current tow is a 91 Dodge 3/4 with a pintle hook mounted where the plate normally goes, plate relocated to the bumper. (and then a ball hitch on the frame underneath for the "little" trailer). The 24v bulbs are a...