So I am attempting to install an aftermarket radio in the durango. Its an 01 with the infinity system. With the key out and the car off, I'm measuring a positive 10.6V on the switched acc lead at the radio. The stock radio worked fine, but the aftermarket will not shut off with the key. Is this normal for a Durango or do I have some sort of voltage bleed? If its normal, any ideas for a good switched 12V source to use to turn on the radio?