Quoted from JeffThanksYou:Thanks Tomass & currieddog. Very helpful info. Not sure why mine was done by removing the wire to the "step down" coil lead but I like the idea of all components (other than the adjusted switch) working properly on the machine- will make the correction
The problem with disabling the decrement coil is eventually you'll reach max credits then you can't win games.
The above advice is the proper way to do it. You see all sorts of crazy hacks for this.
The first game I ever owned had a jumper soldered on the zero position switch so even when it opened it was "closed." It worked fine so I never changed it. Still there 50 years later.