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Thread: How-to wire two fans for high/low operation.

  1. 06-03-2008 01:55 AM #1
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    Default How-to wire two fans for high/low operation.

    You have to use a Bosch automotive 5-pin relay with a normally closed center (87a) pin. Get one rated for at least 30 amps.
    You can use the wires at the stock fan plug for the CCRM labled wires.

    Pin 30 - Fan 1 (+)

    Pin 85 - CCRM Low (green/yellow)

    Pin 86 - Ground (black)

    Pin 87 - CCRM low

    Pin 87a - CCRM high (yellow) and fan 2 (+)
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