A wire is found hanging loose under the trough switches and it isn't obvious which lug it came from.

Switch wire broken off near the trough: it goes on the diode's non-banded (anode) end

Cause: The wire had broken off where it was soldered to the switch diode.

Checks

• Look for leftover solder or a stub of wire on the diode lead; that marks where it was.
• Compare with neighbouring switches wired the same way.

Fix

• Solder the wire back to the switch lug on the anode side of the diode (the end without the stripe), then check the switch in switch test.

Systems

• Williams System 6 / 6A

Games

• Time Warp

Related tips

• Unreliable switches where the ball rests (trough, locks, kickouts)
• Unreliable switches where the ball rests (trough, lock, kickout)
• Column 1 switches and switch wire colours

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