Diagnosing Electrical System Problems
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Most aftermarket engine control systems have a grounding wire or connection to operate an electric fan relay. These computers are normally programmed to a specific temperature for the computer to allow a ground trigger for the relay. A relay kit like the Painless (PN 30109) PCM Fan Relay Kit is designed to be triggered by the PCM (ECM) and allow current flow directly from the battery source to the fan. View Related Article
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