Radio won't turn on when Charging phone

#1
My daughter's 2004 Corolla has a problem where when her phone is plugged into the 2Amp USB port on a car charger, the Radio won't come on.We have tried multiple chargers so we know it is not a defective charger. If she were to plug into a 1Amp USB charger the Radio works fine! The cigarette lighter port is rated for more than 2Amp draw so thinking that something is wrong. I know they are on the same circuit. I assume there is a voltage drop, but not sure where to even start looking for it. Any suggestions? Is it likely to be a ground connection? Back of the radio, wires to the lighter, etc?

Anyone see something like this before?

Thanks.
Kent
 
#2
Hmmm, sounds like some kind of voltage drop to me too. One of those you may never find so if it were me I'd go thru and unplug then reconnect all the wires to the radio, relays, fuses, etc. See if the problem goes away. I'm thinking it might be a bad/dirty connection in one of the wire looms or maybe just not plugged in good. I'm no expert but that's what I'd do first. Hope you find it. :)
 
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