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You need to check three wires with a voltmeter or test light.

1) Red - Ignition switched power
2) Yellow - Constant 12 volts (hot at all times)
3) Black - Ground

Check the red and yellow wires for power (with key in accessory or run position for the red wire) at the connector. Use the black wire in the connector as your grounding point for the voltmeter/testlight to verify you have a good ground.

I had this problem in my '87, and it turned out the pins for the yellow wire in the connector were no longer making good contact - which meant no juice to the radio.

And if you haven't already, check the fuse.

-SM
 
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