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inertia switch

Glossary “inertia switch” Definition:
Switch in the fuel pump circuit which shuts off power to the fuel pump in the event the vehicle is involved in a collision. This switch must be manually reset.

inertia weight

Glossary “inertia weight” Definition:
A small, steel flywheel used to dampen drive-line vibrations on certain applications; generally located on the slip yoke, drive pinion yoke, or near an end of the drive shaft.