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Spent today pulling out 40 years of added/custom wiring from my truck, one I found looks part of the stock loom, but not connected.
It's blue/white, and runs down the left side of the bay (of my Australian RHD truck), ending just behind the light.
A Wiring colour sheet I've seen mentions blue/ white as for turn signals, but mine are fine, it also ends in a ring terminal, which is odd.
Not a lot to go on, but I don't have it running right now, so can't check if it's got 12v