Wow, behind the radio? That should be simple enough to get to - or is buried further down where i might have to remove the dash too :s?
I think that relay is different somehow. I already took the relay out that you're referring to and bought a new one, and it didn't fix the problem/make any difference. Taking out that relay, however, definitely keeps the radio off. Also, when i look at the delay relay part online, its a 5-pin connector, whereas the relay you've referenced is only 4-pin.
Are you suggesting that the instrument cluster is bad?You did follow that line to the center row bottom, right? The signal to that relay comes from the instrument cluster.
2002 - 2004 Ford Super Duty Instrument Cluster Repair | CBM
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