Changing a radiator fan control switch to an ECU controlled fan with a manual over ride switch.

Thanks to ben7 for creating this document and to Paul Deslandes and Jonathan Kay for their valuable input.

This is a guide to allow your ECU (in this case an Emerald K3) to control the switching of your radiator fan in lieu of the existing fan control switch (which is plugged into your radiator). It also includes the installation of a manual over ride switch as well.

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