Starter wiring

[climberman]

My truck is finally running but we still have few problems one that is driving me crazy hahaha. Sometimes it starts and then another time you will shut it off and it won't start you just hear a click from the solenoid. The solenoid isn't pushing into the flex plate. when it is clicking If you run a wire from the battery to the solenoid it will start the truck just fine. Everything is bran new, battery, alternator is 100 amp , new regulator from summit racing , new ignition switch after market. The wire from the ignition goes straight to the solenoid am I missing something should there be a relay. I have a 1966 c10 with a 283.

Thanks for the help
Rocky