2003 Chevy S-10

Truck runs fine until u get to a hill then the truck boggs way down to the point where it comes to a complete stop half way up the hill. It never stalls out put it has no power to move on its on, also while this is going on everything electrial starts acting up lights turn off, radio turns off, dashboard lights turn off etc. The transmission is electric, and it has trouble shifting thru the gears upshift, down shift, I bought the truck brand new and im the only one ever to drive it. It seems to me its more an electical problem causing the transmission problem. Could it possable be a coil bad or on its way out? Thank-you for your time and help