-place the positive test lead on the negative terminal =should read the same as zero'd test leads 0v -place the positive test lead on the positive battery post (the terminal made of lead)=should read battery voltage 12.36v -place the positive test lead on the white wire which is supposed to be connected to the positive cable aka the thick ass starter wire = should read battery voltage 12.36v -finally unplug the big blue fuse and touch the test lead to both sides of where it plugs into Prong closest to battery = ~15mV (millivolts) Prong closest to headlights = 0v
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