i have an 89 305 tbi.the car always starts when its cold.after driving a while on a hot day it won't start.not even a click.ive added a wire to the switch terminal of the starter.touching the wire to the positive side of the battery will start the car when the ignition switch won't.i replaced the starter solenolold.no difference.before i buy a 19 dollar relay anyone have any other idea of might be the problem?

 

U could bypass the relay

 

But before you do ;
when no crank occurs you should put a DVM on the starter circuit and follow power through to where it " disappears".
Could be Ign switch , neutral / clutch switch or relay at fault

 

Aaah yes, the test, i always skip that step lol

 

Cheaper than throwing parts at a problem until you cure it
by elimination