First of all I am not a golf cart expert, however, I am a retired electrical engineer. I have the equipment to test your radio. It may have been damaged by connecting it to 16 VDC. Also, as I recall the electric carts usually have equipment to operate the 12 vdc accessories (lights, horn, turn signals, etc.), and if this converter has sufficient capacity then the radio should be connected to this supply. If it does not have sufficient capacity, and additional converter can be added.
Send me a PM if you want to get together, I am located in the village of Pinellas.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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