69 Plymouth sport satellite

[Charger1967]

Started my car just fine, next day turned the key and it just clicked, checked battery connection, that was fine still clicked so I jumped across the relay and it started, could it be the starter relay off the firewall? If so is there a way to test it to be sure it’s that? Thanks in advance

 

[dadsbee]

Next test, instead of jumping the bat to starter terminals on the solenoid, pull the yellow wire off the solenoid and jump Bat to the lug the yellow wire was on..