I just replaced the transmission in my 2004 gmc envoy. i drove it into the shop so it was running ok. its a no crank/ no start condition. i noticed the lights dont come on when i open the door, and there is no radio or keyfob actions. the cluster lights up when i turn the key but nothing else happens. i tried in nuetral and in park. i rechecked all electrical connections and they are ok. this is a salvage yard transmission. any guesses?