Question about 1997 Chevrolet Blazer
How do I conduct a voltage drop test?
First, check battery post to cable connection: positive meter lead on battery positive post, negaitve lead on battery's positive cable clamp. Crank the engine and note the reading. A good connection should have zero voltage drop. Second, check the positive cable: positve meter lead on positive battery clamp, negative lead on starter terminal connector. A good cable will show a voltage drop of .2 volts or less while cranking. Third, check the starter connection: positive meter lead on positive battery terminal on the solenoid, negative meter lead on actual starter stud. A good connection will have a voltage drop of near zero volts. Now to check the negative side of the circuit. Total drop on the ground side should be .3 volts or less and can be checked by placing positive meter lead on starter housing and negative meter lead on battery ground post. Take your reading while cranking the engine, and be sure your connection at the starter is solid and clean. If total voltage drop on this side of the circuit is excessive, complete testing at all connections in the same fashion as the positive side of the circuit. Check the following: between battery post and clamp (zero voltage drop), cable end at battery to cable end at engine. (.2 volts or less), cable end at engine to engine itself (near zero voltage drop), and finally between starter housing and engine block (.1 volts or less).
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Posted on Sep 01, 2008
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Posted on Jan 02, 2017
SOURCE: voltage drop test
A voltage drop test is done using a DVOM. Set the meter to the DC voltage scale. Depending on the side of the cicuit you are on, place the positive lead on the most positive end of the cable.(closest to the positive terminal) and the negative on the other side of your cable/connection.Then exercise it. ( IE: Turn the headlight switch when checking voltage drop across the ground). The meter should read as close to zero volts as possible. (acceptable to rise up to 0.03v on the ground side) The reading you get is the amount that the cable or connection you are checking is drawing from your 12v source. You should do this to check for concerns in a circuit, so do not clean the connections until you perform the test.I hope this is helpful, if you need more info., drop me a line.
Posted on Aug 31, 2008
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