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Hello,
Except for the headlights, ALL of the external lights on all 1800 Volvos get their grounds through the mounting studs/screws, so it is important that the areas on the body that is under the mounting nuts/screw heads are clean and can pass ground to the backing plate.
We like to use KEP nutS or a nut along with an internal or external toothed lock washer, so that good contact is made for the ground path.
FYI, a KEP nut has a toothed lock washer attached and they are available in most USS/UNF and metric threads.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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