Pressing start once sets up a game for two players instead of one.

Start button gives a two-player game: wire on a latch relay touching another

Cause: On the player latch (trip) relay assembly in the cabinet, a wire on one latch relay was touching a tab on a different latch relay.

Checks

• Check that the second player relay is not tripping or staying latched when only one start press is made.
• Look closely at the wires and lugs on the latch relay bank for any that touch neighbouring tabs.

Fix

• Bend or reroute the wire so it clears the other relay's tabs.

Unplug the game before working in the relay bank: EM wiring carries line voltage in places.

Systems

• Electro-mechanical

Games

• Big Indian

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Source: Pinball Repair help group!! (Facebook group)