I recently purchased a General Lee and had some modifications done—talkback relay put in, modulation limiter (governor) removed, and had the receive increased. When I placed the radio back in my dump truck, with the power on low and the amp turned on only—no other buttons—I get a constant squeal. This didn’t happen before the radio modifications. The radio works fine without the amp, but with it it squeals on low power. I tried it out on high power, and I don’t receive a squeal. I don’t want to run with the radio on high with the amp on and rush damaging my radio. Any suggestions as to what the issue could be?