The general illumination stays on all the time and never flashes with the game's light effects. Inspection shows the GI connectors at the power supply had been bypassed with hard-wired leads.

GI always on after a previous owner's wiring hack: repin the GI connectors instead

Cause: A previous owner had worked around burnt GI connectors (CN8 on the power supply and J5 on the playfield power driver board) by wiring the GI straight on, which also bypassed the game's control of it.

Checks

• Look at the GI headers and plugs on the power supply and the power driver board for burning and for added wires.
• Check that voltage is present on the header pins.

Fix

• Remove the hack and repin both GI connectors with new housings and crimp pins (replace burnt board headers too), and key the new plugs.

Switch off and unplug the game before working on the power supply connectors.

Systems

• Data East/Sega CPU Version 3b

Games

• Baywatch

Related tips

• DMD shows random garbage after reassembly: failed display driver board
• Only GI for 10-15 minutes after power-on, coils lock on and blow fuses: weak 5 V supply
• Data East/Sega: PPB fuse and backbox fuse blowing: shorted Q3 and a plug one pin over
• Every CPU-controlled lamp is out

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