Yeah, the Furitek stuff is plug and play with the ilold AE-6 ESC/Rx. The new ESC/Rx that Horizon switched to is not compatible. So that would require a new Rx and Tx.
The problem is that you would have all that wasted real-estate of the old ESC in there. But Josh (Harley Designs on YT) from...
Are you plugging those LED's in with the black wire on top? That's upside down. The black wire is ground. The bottom pins on your receiver are the ground pins.
I sent you a text message.
Make sure your cables are the right way too. Plugging them in upside down could burn things up.
And yeah, the AX-4 and AE-6 were the original electronics when the SCX24 released.
If you get a Furitek system, it should work with your radio. The newer ESC they are putting in the SCX24 does not...
You may have a burned up the motor or the ESC.
The dual rate steering knob is how you set your endpoints. Once set, don't move it or you could burn up your servo.
To set the endpoints, turn the wheel full right and hold. Adjust the dual rate knob just to the point the linkage binds up, then...