Not sure what's going on? Battery, starter? Idk

good find! you may have just saved a lot of folks some headaches.that's the signal wire from the ignition switch(electrical part of the ignition switch)some folks get confused when you say ignition switch,and think of the key lock cylinder part! very good find.

Thanks, ill try to clear it up a little, Its the purple wire coming from the relay in the fuse box under hood on the driver side. It leave's the fuse box and goes in a wire harness under front of motor to the starter and connects on top of starter solenoid. Look at the purple wire where its crimped to wire connector at solenoid if it's green corrosion or white film on wires at connection, or maybe some broken wires at connector, replace, because its not getting enough signal to engage solenoid to starter, good luck.