AM/FM Stereo Adapter

Q: AM/FM Stereo Adapter

Was there an option for an adapter to be plugged into an AM/FM Pontiac Stereo? If so, what did it do?

A: I just took my 1968 AM/FM radio to a local guy here in PA that is listed in Hemmings. He is an old radio “guru”, talked to him for almost 2 hours one day….he then pulled out I beleive the auxilliary plug for the stereo amp hook up and looked at the number of prong holes in there, he was able to confirm from this that the radio was indeed a Pontiac radio and a 1968.

A: The guy is correct in the description of the “plug” in the Firebird radio. The factory supplied an am/fm radio with this shorting plug, which was removed at the dealer when the FM multiplex adapter was installed. This plug has a pin set up thats the same as an old vacuum tube,and has the controls for volume ,balance,and tone running thru it. When the multiplex adapter is installed by plugging into the socket where the plug was , it disables these functions in the radio and moves them to the adapter. The adapter adds the other side of the stereo signal to the 4 speaker system. This was the dealer installed setup for 1967 and 1968 on the Firebirds,however all other models could get a similar system as factory equiptment. I am looking for anyone that has or had the 1967 and 1968 stereo adapter.

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