Amp isn't getting enough power from the radio

[spoods]

So I have an A/B 1200 boss amp, works fine. It's just my radio isn't putting out 5 volts to turn it on. It worked for the first month, and now it won't put out more than 2.5 volts to the trigger switch. I now just have 4 double A's hooked up to it tenporarily. But wondering why my radio quit putting out 5v

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