Radio power mystery

[68 ReNay]

sometime back my radio started to turn off and back on randomly when i'd rev the motor. i've had the radio in several years without problem. then recently, doing the same activity it would turn off and not come back on - every time i did it. id start the truck and the radio is on and working fine. tap the accelerator and it went out.

i'm not an electrician but i check to see that steady power was running through the wire, from the fuse block to the plug in the back of the radio. all checks out fine (even when the radio has cut off, i pulled the plug and tested it - the pen light comes on). there doesn't seem to be a short anywhere.

it's the strangest thing and i'm hoping someone knows whats up. i don't know that it matters but: '68, 350/350, original fuse block, kenwood CD player. . .

thanks in advance for any help you can offer!

[cdowns]

ii'd check to see that it is grounded correctly first

[68gmsee]

Yeah, it could be a loose ground but also check your antenna and speaker connections. You may still have power to the radio but not to the speaker or the antenna. They could be losing contact to ground.

[68 ReNay]

thanks for the replies. i did check the ground. i did not check the individual speaker wires because it wasn't just the sound that stopped, the lights on the CD player went out as well just like if you turned it off. i pressed all the buttons, but nothing.

[Dingfodgy]

Red wire is constant 12vdc and yellow is switched power....correct? Did you check both of those? Maybe it's a bad pin in the plug @ the back of the head unit?