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Adjustment Range:

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OTC 7645 Parasitic Battery Draw Test Switch Shop By Category > Cooling System>Radiator Filler Brush Research GBD41224 Gbd 4-1/2"OTC Tools OTC 7645 Parasitic Battery Draw Test Switch. Finding electrical problems that drain the battery is getting harder all the time. Using the draw test switch w your digital amp meter takes the guesswork out of a complicated job. Attach the test switch between the negative battery cable & the battery, & then road test the vehicle. Next, connect an amp meter to the switch to determine the parasitic amperage draw, & locate the excessive electrical