Quote:
Originally Posted by FAKKY
Thx for update Roger.
Can you explain the wiring ..... In case I end down that road  |
The Dakota controller uses one engine coolant temperature sensor and is programmable to switch fans for low and high speed at temperatures you select. The 3 relays are wired to run the dual fans in series for low speed and in parallel for high speed.
DC motors run in series will run the fans at half-speed and when run in parallel they run at full speed.
Here's a diagram I wrote that shows how to connect them with the pin numbers on standard Bosch type relays. The wiring schematic I used for as a guide for this came out of a GM shop manual. GM used this setup for many cars before they went to a PWM type system.
Grounding he "L" wire runs the fans at half-speed (series). Ground both the "L" and the "H" wire runs the fans at full-speed (parallel). The Dakota controller will do that at the temperatures you set.
The Dakota controller also has an input for an A/C trinary switch. That allows the controller to switch the fans to full-speed when the A/C requires it based on high-side pressure.