Glenn,
I am not trying to be a smart aleck. You said you have 12v at the ignition switch. You seem to be a savvy guy. Did you mean you have 12V when the key is turned to start? Because the ignition key has at least two positions, maybe three if there is accessory. All three will have 12V, but the one you want to confirm is the start circuit from the key.
If that's what you meant, then I apologize for the comment.
You said the relays in the back click when the switch is on, and that you have 12v on the hot wire into the relays.
I had this problem once with a relay in the start circuit. The relay was part of the antitheft system. The relay would click, and it was getting voltage, so I assumed it was good. It was only after I triggered the relay, and ohmed the contacts that I discovered the relay was closing but the contacts had very high resistance. Enough resistance to keep the circuit from making. I would check the resistance on the contacts for all the relays in the circuit. And it took me three weeks to sort it out to this point.
