Alpine cda-7892 Head unit overheating

Nov 04, 2007

-   I have a jeep 1996 jeep cherokee. I have had the head unit installed along with a 600 watt amp and 1 12' sub for almost two years. About a month ago, i started smelling smoke. I completle unwired all my additional accessories (off-road lights, cluster gauges) to narrow the problem just to the radio. Once i put the fuse into the relay that connects to the deck, it begins to generate a lot of heat almost instantly. After about thirty seconds it starts smoking until i unplug the fuse from the relay. I have double checked the ground. What else could be causing this problem?-   Guest