new head unit not powering on

[tauket2]

hi,

I just switched out the factory radio in my 95 cavalier z22. i switched it for a pioneer DEH-P4000UB unit and connected it with a wiring harness that the guy at the instalation shop gave me.

i crimped all the wires and once everything is plugged in and the radio is grounded, the unit simply wont power up. i unplugged it and plugged the old radio and it worked. the new one just doesnt work....

does anyone know whats going on here???

thanks
-chris-

[PaulD]

the wiring harnesses are not always correctly pinned. Plug in the harness without the radio and check all the voltages

[tauket2]

ok, my buddy suggested connecting the yellow and red wires together (battery and accessories wires). i tried it and now the radio works fine. Only thing is that i can turn the radio on with full functionality even when there is no key in the ignition.

is this a good or bad thing?

-chris-

[PaulD]

not good or bad I suppose, but what it's telling me is that the wire the harnesses is tapping for constant 12 volts is good and the one that is tapping switched 12V is wrong