Pin B21 should be ground on your original EHC.You are right, directly at the ignition switch there are 2 orange cables, but at connector 21 one of these orange cables goes on a black one that goes then ove connector 24 and 23 to PIN B21 from backbone harness connector B. No the switch has only the 2 positions ON and OFF
Just an FYI PIN numbers don't align on the old EHC with the RIP kit.
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