Bally EM takes a coin or credit but doesn't begin the reset.

Bally EM won't start: dirty game over relay contacts

Cause: The reset relay is fed through a switch on the game over relay; dirt there is a very common Bally fault.

Checks

• Watch the game over relay contacts as start is pressed.

Fix

• Clean and gap the game over relay switches.

Systems

• Electro-mechanical

Related tips

• Game never resets: bent coin door switch
• Outline of a Gottlieb reset-bank game start
• Using the start sequence to find where a reset stops
• Starting a 1950s Gottlieb light-box game without taking a credit
• Start sequence of 1972-78 Gottlieb single players without a reset bank
• Gottlieb reset-bank game won't start
• Gottlieb start halts after reels reset: S Armature switch

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part Two, Clay Harrell (pinrepair.com)