i have a 1993 toyota pickup 4x4 and the engine blew so we bought a used engine, we dropped it in there and got evreything hooked up and then when i went to turn the key to start it nothing happend, the battery is good and all of the dash lights are coming on but nothing is happening when i turn the key. i went and had the starter tested but it was good, i put it back it and tried it again and still nothing, any one have any ideas?