TSB : Electrical Troubleshooting Tools: Voltmeter
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The DC voltmeter is used to measure circuit voltage. A voltmeter with a range of 15 V or more is used by connecting the positive (+) probe (red lead wire) to the point where voltage will be measured and the negative (-) probe (black lead wire) to a body ground. Fig 1: Identifying Voltmeter Courtesy of MAZDA MOTORS CORP.
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