Yes, I bought the classic update kit #500560, and 500558 did come with the kit. The only thing I purchased outside of the kit was my dome light and a new turn signal switch/mechanism. None of it was installed by anyone other than myself. The only 'relay' that I received is the one I posted a pic of in the earlier post and that one came with the AAW kit, the relay that is on the radiator support wall is the one that was already on the truck.
I certainly do not have a red and/or black spare wire coming out of the firewall, and I don't believe there are any loose spare wires on the cab side either. Also, if you notice on sheet 3 (see pic) what they have listed as a horn relay in the diagram, I don't have that connector, I've looked long and hard for it, I'm guessing that is where the relay in question would have been attached. The only connector I have that resembles that one is the one for the ignition switch.
Last edited by jtroberts; 02/24/20214:23 PM. Reason: clarification
"The greatest use of life is to spend it on something that will outlast it" ~ William James
'25 Chevy Superior '66 Chevy C10 '03 Chevy Silverado 1500 HD
