since the Ford E3/450 is a commercial chassis and ford dosent know what the client will use it for, these wires are for "client use". some are for the aux dash switches option. some interface to the engine/tranny computer for high idle (like when running hydraulic pumps). and some i still haven't figured out yet.
pic of aux switches:
https://www.amazon.com/Ford-Upfitter.../dp/B01C39SQPQ
attached is some high idle info i found.
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