Another car radio question please...the radio in my 1977 Chevy truck is difficult to turn on. By that, I mean you have to turn it on and off several times to get it to come on. Also, when the radio is on, you can turn off the ignition switch, but when you turn the ignition switch back on, the radio does not come on. For a normal old tube radio, I'd just suspect a gummed up pot and spray it good with contact cleaner. I tried that with this radio to no avail. Could someone point me to what the problem might be and how to go about solving it? Radio seems to do fine once I get it "started." Thanks much!!!

:Thanks Edd
Radio is installed in the truck at the moment, so will have to pull it to try to determine model number. Also, there is no ground strap from radio to dash panel. Could this contribute to the problem?

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: : : : : : : : : : : : : : Need radio's most “honnable” model “numbah” for further researching, (if required). : : :Otherwise, I'm considering the age to be borderline on mechanical versus electronic switching, giving the consideration now. . . . . as to it being mechanical switching. : : : :And I would take a very educated guess that you very likely never even got close to the contactive innermost workings of that switch mechanism, unless the radio was pulled and the dust covers dropped to fully expose the switch mechanism. : : : :Then, to be sure, I put a drop of refrigeration putty (or childs modeling clay on the topside of the switch) (metallic chaff control) and then just barely drill a 1/16 th inch hole topside of the control. This positively permits solvent flooding within the switch cavity. : : : :Then the switch compartment is flooded, via that access hole, with “Radio Shack” tuner cleaner, that has its plastic tube mated with an insulin syringes ***small needle. (Rolling on of plastic tape onto the basic tuner cleaners plastic “extension “ spout/tube will interface the two plastic pieces different sizing. : : :(***If you have medical supplies access…a # 17 needle, on upwards in size numbering. . . . .will result in faster flow than the insulin syringes small needle sizing. . .but more people probably have free access to a diabetic relatives cache of syringes. ) : : : :Then rapidly and vigorously work the switch ‘bout one hunna ‘lebenteeen times and then check out that switch for repetitive continuity. : : : :ZUJ'ing for feedback. . . . : : : : : : :73's de Edd ::> : : : :

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:Unfortunately the model nbr tag is illegible. Fortunately, the gang of 4 rotary controls do have slots that allow the spray tube to introduce solvent into the switch cavity. I did as you suggested and reassembled the unit and am testing it now. So far, so good. The radio comes on when switched on; however, it does not com on when the ignition switch is turned on. That is certainly not a problem, but makes me wonder why. Any thoughts? Otherwise, I'll consider this problem solved for now. Again, thanks much!!!
:Thanks Edd
:Radio is installed in the truck at the moment, so will have to pull it to try to determine model number. Also, there is no ground strap from radio to dash panel. Could this contribute to the problem?
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:: :: :: :: :: :: :: :: :: :: :: :: :: :: Need radio's most “honnable” model “numbah” for further researching, (if required). :: :: ::Otherwise, I'm considering the age to be borderline on mechanical versus electronic switching, giving the consideration now. . . . . as to it being mechanical switching. :: :: :: ::And I would take a very educated guess that you very likely never even got close to the contactive innermost workings of that switch mechanism, unless the radio was pulled and the dust covers dropped to fully expose the switch mechanism. :: :: :: ::Then, to be sure, I put a drop of refrigeration putty (or childs modeling clay on the topside of the switch) (metallic chaff control) and then just barely drill a 1/16 th inch hole topside of the control. This positively permits solvent flooding within the switch cavity. :: :: :: ::Then the switch compartment is flooded, via that access hole, with “Radio Shack” tuner cleaner, that has its plastic tube mated with an insulin syringes ***small needle. (Rolling on of plastic tape onto the basic tuner cleaners plastic “extension “ spout/tube will interface the two plastic pieces different sizing. :: :: ::(***If you have medical supplies access…a # 17 needle, on upwards in size numbering. . . . .will result in faster flow than the insulin syringes small needle sizing. . .but more people probably have free access to a diabetic relatives cache of syringes. ) :: :: :: ::Then rapidly and vigorously work the switch ‘bout one hunna ‘lebenteeen times and then check out that switch for repetitive continuity. :: :: :: ::ZUJ'ing for feedback. . . . :: :: :: :: :: :: ::73's de Edd ::::> :: :: :: ::

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:Turns out it is a mechanical failure of the switch. It finally completely stopped clicking at all. Before I take the board out, can someone tell me if I can replace the off-on switch alone of if I need to replace the whole 4-rotary gang? (It APPEARS to jsut lift off the board). Unless someone has parts available for sale, I'm thinking I just need to buy a donor radio on ebay. Any other thoughts? Thanks!! Wish I had a model number...but maybe the switches will interchange.
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: : : : : : : : : : : : : : Need radio's most “honnable” model “numbah” for further researching, (if required). : : :Otherwise, I'm considering the age to be borderline on mechanical versus electronic switching, giving the consideration now. . . . . as to it being mechanical switching. : : : :And I would take a very educated guess that you very likely never even got close to the contactive innermost workings of that switch mechanism, unless the radio was pulled and the dust covers dropped to fully expose the switch mechanism. : : : :Then, to be sure, I put a drop of refrigeration putty (or childs modeling clay on the topside of the switch) (metallic chaff control) and then just barely drill a 1/16 th inch hole topside of the control. This positively permits solvent flooding within the switch cavity. : : : :Then the switch compartment is flooded, via that access hole, with “Radio Shack” tuner cleaner, that has its plastic tube mated with an insulin syringes ***small needle. (Rolling on of plastic tape onto the basic tuner cleaners plastic “extension “ spout/tube will interface the two plastic pieces different sizing. : : :(***If you have medical supplies access…a # 17 needle, on upwards in size numbering. . . . .will result in faster flow than the insulin syringes small needle sizing. . .but more people probably have free access to a diabetic relatives cache of syringes. ) : : : :Then rapidly and vigorously work the switch ‘bout one hunna ‘lebenteeen times and then check out that switch for repetitive continuity. : : : :ZUJ'ing for feedback. . . . : : : : : : :73's de Edd ::> : : : :

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