Ok so aI have read about 30 Hershmann antenna posts and can't find and answer to my troubles.

Symptoms are as follows: With key on and radio on antenna can be controlled via dash switch. When antenna is down and radio is turned on antenna comes up half way on it's own per spec. However, when radio or car is turned off antenna doesn't retract on it's own.

What I have tried: swapped out both radio and switch from my parts car, no change.

SO what do the hershmann experts here think I should look at next?

BTW 1983 300D turbo stock radio stock antenna and power unit.

Thanks for any help. Bill

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1972 280SE 4.5