How do you test a ground wire?
Fleet Owner
Joined: Apr 2008
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You need a digital meter. Then with one lead on the negative battery terminal you touch the other lead to the engine block, then the body. In both cases where you touch the leads has to be clean metal. The readings you get should not exceed 0.5 volts. If the readings are 0.5 volts or less the grounds are okay.
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Freshman User
Joined: Jun 2013
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Thank you so much! I just want to make sure I have this correct. With the meter I attach one to the neg post and the other to the engine block. I then touch the ground wire and if it measures 0.5 or less, it is good?
Fleet Owner
Joined: Apr 2008
Posts: 24,316
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From: 0,0,1
Not quite...you go from battery negative to engine block and note the reading. Then you go from battery negative to body/frame and note the reading. Neither of these two readings should exceed 0.5 volts.
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