I haven't listened to AM RADIO in years... Back in the my youth days it was CLEAR CHANNEL XERF DEL RIO TX. The AM Antenna was in Mexico running high power and the studio was in Del RIO TX... I lived in Southern Illinois then...
This isn't going offer any possible fixes for your radio problem - Just passing along showing what other users have...
This is my JENSEN RADIO setup in my OFF-ROAD POPUP. I couldn't go anywhere without my AM/FM Radio setup - pretty much ON 90% of the time when camping... Does great on FM but never hear anything on AM except static noises...
The Jensen FM Radio has its own radio ON-OFF push button that when operated will completely shut down the radio and disable all of the presets-everything etc...
My idea was to add the ACC-IGNITION switch that you see to the right of the Jensen radio.
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This is my AM/FM Flexible "Rubber Duckie" Antenna shown on the Rear Side of my 2008 Starcraft 14RT trailer... The Rubber Duckie Antenna is down on the side of my trailer not to be confused to another Ham Radio antenna installed up close to the roof of the trailer.
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When I show up at new location then I turn on the main radio push button switch and the ACC-IGNITION and set the different push buttons station selector. When I get ready to turn 'OFF' the radio after doing all of this I will only use the ACC-IGNITION switch on the right side to turn off the radio. Leaving the main push button for the radio 'ON' keeps all of my push buttons settings for this location active...
I use the FRONT-REAR Slider speaker control on the Jensen Radio for the Inside-both-outside speakers on my trailer...
To listen to the FM RADIO I just flip on the side switch and continue to use my station push button settings...
When we go to a new location we have go through all this again...
Roy Ken