Hi, I'm new to the forum, just bought my 75 and it will only start with a starter switch when connected to the battery and I believe the starter wire or th silinoid wire, how do I get it started using the key in the ignition

 

Welcome to C.O.! I am trying to decipher your statement! I assume that your using a remote start switch to crank the engine? If this is the case, I would check to see if your neutral safety switch is working or out of adjustment.

Follow your steering column down towards the firewall.
http://www.1aauto.com/neutral-safety...=299160&y=1975

Pat

 

Welcome to the site, x2 on checking the neutral safety switch purple wires.