Don't pull the cable off an alternator car while it's running to check the output. That is a QUICK way to burn the alternator up. Works with generator cars OK.
Just get the battery and charging system checked by someone with the equipment.
If it only happens with the radio and the engine isn't running. I would check battery and also the radio draw.
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Dave
1968 Cougar
2004 Thunderbird
2007 F150 Harley-Davidson, SuperCrew
1986 LTD
1997 Ranger
1992 Honda Civic
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