Starter Will Not Disengage

Could be malfeasance going on inside the solenoid

Could be the pair of wires going down to the solenoid.

could be the relay (you replaced)

could be something keeping the yellow start wire hot, but putting the shifter in any gear except park/ neutral should stop it.

First remove the two "push on" connectors off the relay, if that does not kill it,


Second thing do do is unhook the wire coming off the relay and going to the solenoid "start" terminal, that's the smaller wire hooked to the "square" exposed relay terminal.

If that does not shut it off, check the two wires going to the solenoid for shorts.

If that seems OK, remove the small solenoid wire at the starter, and it THAT doesn't kill it, it's in the starter solenoid.