You said the constant power wire gets voltage just like the ignition lead...it shouldn't. That's why they call it a constant hot. Use your multimeter to make sure you are getting +12 volts with the car off and the key out of the ignition. If not, threre is your problem. That is what that wire is intended to do, keep power to your deck to remember your presets, time, etc. I am asuming that you are hardwiring the deck in (i.e. your factory harness is no longer attached, just a mess of wires, if so maybe this will help you out (hope this isn't too small)
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