Start with the battery cable connections. The jumper cables may be squeezing one so it makes a better contact. You can also identify that by doing a voltage test. Turn the head lights on so some current is trying to flow, then measure the voltage right on the battery posts. Next, move the meter probes to the cable clamps. The voltage must be exactly the same. Keep moving down the line until you find a spot where the voltage is lower. That will be the point of the bad connection.
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Sunday, April 7th, 2013 AT 11:16 PM