How come when you turn the key all the way to start on your 1965 ford thunderbird it does not start your thunderbird has has brand new starter and a brand new solenoid where else should you look?

Assuming the battery is good and all battery cable connections are clean and tight, try moving the shift selector into neutral then turn the key to start or wiggle the shift lever in park as you turn the key to start. If it starts, check the neutral safety switch, it may be just out of adjustment. Note, if the two small wires attached to the new starter solenoid mounted on the inner fender are switched, it won't start. Note, also the new starter solenoid must be bolted down to metal and grounded to operate.