Quoted from GPS:I have checked the coil out if the circuit and it is good showing about 5 ohms.
That's about half what it should be. If you don't have a manual, you can download one at the link below.
Knocker coil is a 26-1200, which is about 10.8 ohms.
https://flippers.com/coil-resistance.html
Get the right coil before you do anything else. Likely another problem elsewhere, but start with the right coil (or double check part number/ reading on existing coil).