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Wiring Diagram for Datsun 510 (68-72) cooling system using electric fan upgrade for two speed fan control - PAGE-1.

See PAGE-2 for component notes and design parameters.

Component design descriptions for proven as-built system with usage details.  Design for stock L16, L18, or L20B engines,  Likely a great upgrade for other engine swaps such as SR20, KA24, etc.  The devil is in the design details.  The circuit set up for a single fan but can be easily adapted for dual fan system.  The dual speed system works best using a low temperature dual range switch as described in notes on PAGE-2.  Refer to PAGE-2 for important notes about cooling system build.