whine

Hello! I have alernator Whine issue on my Kenwood TK-790 Mobile Radio Setup. The Vehicle Everything is in Is a Ford Expedition 2000. I have it configured in a Dualband Setup with a TK-890. Both Radios Controlled with a Single Control Head. The TK-790 Is Radio 2 in the setup and is Connected...

while testing my HT1000 UHF radio on a ham radio repeater I happened to notice a high pitched whine / squeal while transmitting and don't know what it is, i can tilt the radio in another position and it stops, and it will not whine on low power. It only whines while transmitting on 5 watts...