Those are "coin lockout coil" wireforms. In the electromechanical days, the lockout coil was there to prevent coins from being accepted if the machine was turned off or if the score motor was cycling. Kids would insert coins when the score motor ran in an attempt to get extra credits, but sometimes they would flat out lose there coin and not get any credits.
In the early electronic pinball days, manufacturers carried over having lockout coils. The coil would pull in when the cpu board finally booted up and the game was ready to accept money. As an interesting aside, when Gorgar first came out, people were losing their quarters in the machine because they were inserting coins when Gorgar was speaking. Williams determined their hardware was at fault (not enough memory) and issued a service bulletin about this. Their solution was to slap on a decal that said, "Gorgar says do not insert money while I'm talking" plus they issued some new game roms with a software patch that de-energized the coin lockout coil while speech was occuring. Thus the game could not accept money while it was talking.
Starting with "High Speed" Williams discontinued providing lockout coils on the coin doors. Sure, the wiring was their for them if you wanted to add them yourself. Williams made lockout coils optional and about two years later discontinued them altogether. Some early "High Speed" games did ship with lockout coils installed, but most did not.