I think that is inacurate for trucks. I am pretty sure the power T's off to the horn relay on these...that looks to be a car schematic to me.
Jones, I think your trucks has been converted to an internally regulated set up.
That plug, are the two spades in it like this - - or are they like this ||
If it is tha latter, then you have messed up mickey mouse wireing. If it is the former, then you have a home brewed conversion that may or may not have been done properly.
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