I found out why I was having such a problem with my radio. When they made the pigtail conection (red & black wire with fuse) they soldered the ends of the wires together! I was losing power intermittently. Now, anyone with an electronics background should know that you never solder wire ends together. You solder the wire to hardware and couple the hardware together. I lost two days work trying to find the cause. Shoddy workmanship!