The 9811 is in a cat that I do not drive very

Maybe this info can help service info for Arctic Cat 300 Utility Service Manual: Drive Chain
https://www.manualslib.com/manual/855261/Arctic-Cat-300-Utility.html?page=15

Are you sure you are using the audio input wires and not the audio output wires on the back of this radio. there is also an input switch you need to set before the Ipod will work

Did you check both the red and yellow wires? You may have a bad connection elsewhere in the vehicle or even bad solder connections inside of the radio itself.

try pacparts.com.

I would try using a lens cleaner to clean the CD player.

this specific model alpine was famous for that pull the radio out and check the red yellow and black wire were they go into the harness on the back of the radio sometimes the pins in the harness loosen up

i have seen the adaptors for most any radio on ebay for that

YOU NEED AUDIO INPUT SO IPOD CAN WORK

you need to set up your system to accept aux. this means you will need to set the 'aux on', as the default setting is 'off'. use the manual and refer to page 23 & 24. please read the instructions carefully, as they are slightly confusing.

Press "Title" until time is displayed. Then press and hold "Title" for a few seconds until time is displayed. Turn the silver knob to change the hour, after hour is set, press the silver knob to activate minutes. Turn sliver knob to change minutes. Press silver knob to end.