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The stop lamp checker uses the amperage difference between the trunk panel and the two body mounted stop lights to determine if a bulb is bad. Very similar design to a GFCI outlet in your house.
If you have unmatched wattage bulbs, the difference in amperage can be enough to trigger the checker even if all four bulbs work.
Bulbs are dirt cheap so when I have one go out, I replace all four with the same brand.
Doug
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1992 LS Touring (6/91) - Currently undergoing a five speed swap
Black over Claret with spoiler; 235,000 miles; Mods: 2002 Legacy 5 speed, ACT Pressure Plate, Excedy Clutch, Short Throw Shifter, Aussie Powerchip
1992 LS Touring (6/91)
Black over Claret with 2.5" setback spoiler; 202,000 miles; Mods: B&M Cooler
1994 LSi (4/93)
Bordeaux Pearl; 198,000 miles; Mods: Weight reduction.
1969 Mustang GT Convertible
1970 Mustang Convertible
2000 Ford ExcursionSola lingua bona est lingua mortua.
My Locker
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