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Perhaps now is a good time for you to familiarize yourself with the TMs for this truck. Specifically TM 9-2320-289-20, this is page F-4. All this and more available right here on forum in TM section. There are a couple of errors in these diagrams, but I don't think here. Looks like...

Is the purple & white wire still hooked up to relay, or do you get voltage from wire even if not connected to anything? If it is still hooked to relay, it is probably a defective or ground switched relay. Or maybe hooked up wrong. If you get voltage and wire is not hooked to anything...

It is likely either the relay, or the way you hooked it up. Red is hot, 24V, purple goes to starter, black to ground, purple & white goes to ignition switch. Purple should only show 24V when 12V current is sent on purple & white wire, that should only happen when ignition switch is turend to...