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J 38758 Parasitic Draw Test Switch. Otc's 6945 parasitic draw test switch is used with an amp meter (not included) to isolate parasitic amperage draws on all gm vehicles or any vehicle with a side or top post battery. The parasitic draw test switch should never be turned to the off position with the engine running or damage could occur to the attached ammeter or the vehicle electrical system.
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When the parasitic draw test switch is connected between the negative battery cable & negative battery terminal, the pins on the test switch provide a convenient connection point for a dc ammeter to measure battery drain current. If a tool or equipment could easily come in contact with a live. The test switch must be in the on position when removing the fuses in order to maintain continuity in the electrical system.
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Important the test switch on the j 38758 is marked on and off. Install the battery negative cable to the female end of the j 38758. If the fuse blows, install an inductive ammeter and go to step 20. During testing the dmm ma current scale is no longer used, this eliminates the high risk of damaging the dmm milliamp fuse.
