bench testing new radio how to

I bought a Pioneer radio (DEH-X6600BT) brand new and I just wanted to see it power on before I attempted installation, so in my home I used my portable auto jump starter as a 12 volt power supply, and hooked the radio harness black wire to the negative clamp of the jump starter, and the yellow wire from the harness to the red clamp of the jump starter; verified I had 12 volts with my multimeter, yet the radio would not power on. No other connections were made, but I'm thinking the radio should at least power on. Am I wrong about this? I must be missing something obviously. Power and ground; what else could the radio need?

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Richard

You have to connect the radio's red wire with the yellow wire.

Thank you very much.
So it's the red wire and not the yellow which is the true power which operates the radio; while the yellow constant 12 volt keeps the memory and clock of the radio. I get it. But why is the yellow wire so much more of a heavier gauge wire than the red? That I don't get.

Anyway, thanks so much. I though my radio was dead on arrival and it powered right up when I connected the red and yellow.

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Richard

im pretty sure the red wire only switches the radio on and the actual power to run the radio is pulled from the yellow ... AND the yellow keeps the memory stuff when the radio is off too.
back in the old days red turned on and powered and yellow wa sonly memory. not any more.

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yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.