Newer to em, and trying to learn.
Have a 56 United bowling alley small ball bowler
Game has been cleaned - steppers, reals, switches.
When powered on, the ball lift motor, back-box lights and play-field lights come and work as they should. Was not getting power to the game (coin /credit relays).
Had blown the 50 v fuse. replaced and blew again.
Read that a low ohms / resistance of a coil will cause this fuse to blow.
Tested all coils within the game and came up with 5 coils only testing 0.9 to 0.5 ohms. All others tested 3 to 34 ohms.
lock relay (0.6), 1st 2nd player reset (0.9), score motor relay (0.6), game over trip coil (0.6), and player reset coil (0.5).
It is usual to have 5 coils go bad? or does that seem like a lot?
Can understand the lock relay as this is mostly energized, but the player reset and score motor relay look to be in good condition and not burnt up.
What can cause a coil to lose resistance?
Can these be rebuilt or have to be just replaced?