After moving a Gottlieb to high tap, one particular feature lamp (such as Last Ball In Play) runs very bright or keeps blowing.

Gottlieb feature lamp burns out after switching to high tap

Cause: Some Gottlieb feature lamps run from the 30 V coil supply through a 75 ohm 10 W dropping resistor; high tap raises their voltage.

Checks

• On the schematic, lamps drawn among the coils and relays (not with the 6 V lamps at the upper left) have a dropping resistor.

Fix

• Change that lamp's resistor to about 125 ohms.

Systems

• Electro-mechanical

Related tips

• Gottlieb feature lamps burn too bright (28 V through a resistor)
• Playfield lamp fuse blows when one pop bumper fires: lamp socket shorting
• 6 V lamp fuse keeps blowing

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