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Fordfr9

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Posts posted by Fordfr9

  1. On 4/16/2012 at 9:54 AM, wvicary said:

    The Cayenne is a difficult vehicle to trace battery drains due to the complex convenience systems. You can no longer "start pulling fuses" to locate the source of the drain but you need to open both front doors,trips the latch mechanisms, remove the ignition key away from the vehicle and let the vehicle rest in this state a min of 20 minutes.

    One then measures the voltage drop across the fuse and using a cross-reference chart and the fuse rating to determine the allowed milliamps parasitic draw of that fused circuit. You need experience,patience and a good quality DVOM.

    Before going through fault tracing a battery drain be sure the charging system is operating correctly. Even though you have have 14 Volts that does not mean your are producing enough Amps. There is also a ground connection located under the drivers seat which can become loose or corroded.

    Can you hear anything running after the key is off? The cooling fan control module or coolant temp sensor can fail causing the cooling fans to remain on after the key is removed which can quickly drain a battery. Any other electrical problems noticed?

    hello, i wanted to know where i can get this cross reference chart you mentioned and how do i know the allowed draw of each circuit?

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