marlono1 Posted March 16, 2022 Report Share Posted March 16, 2022 Hi I have a g4 atom and I am setting up aux 4 for electric fan but even though it worked before by 12v trigger. I am not having succes Can I use a low level trigger relay to enable the 12v fan? I was thinking of using this: YWBL-WH Relay Module One Way 30A Optocoupler Isolation Relay Module High Power Relay High/Low Level Trigger YYG-2(5VDC) https://www.amazon.com/dp/B07TWH7DZ1/ref=cm_sw_r_apan_glt_i_8VN587K55A5D3EVN3FA9?_encoding=UTF8&psc=1 Not sure what to Power on the board to test without an arduino since signal is coming from the ECU Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 16, 2022 Report Share Posted March 16, 2022 Any standard automotive relay is fine. You need to switch the negative side of the coil. Info from the help file below. Quote Link to comment Share on other sites More sharing options...
marlono1 Posted March 16, 2022 Author Report Share Posted March 16, 2022 so 85 would go to my ECU and 86 would be from ignition switch? 30 battery and 87 to fan Quote Link to comment Share on other sites More sharing options...
marlono1 Posted March 17, 2022 Author Report Share Posted March 17, 2022 got it thanks! Quote Link to comment Share on other sites More sharing options...
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