borkenmotor Posted August 7, 2022 Report Share Posted August 7, 2022 Hi there - I am wiring a chassis harness for a race car with a link ECU. I need to run a relay trigger for the fuel pump, waterpump, and electric fans. I wired in outputs from the ecu to the trigger wires on the relays for each item. When in test mode, the relays do not trigger. These relays also have independent switches which will operate each device, so It is not my devices. The output wires are sending 12 volts, but the relay won't trigger. Are these supposed to be a triggered ground? I could not find any good information on wiring outputs. Thanks Quote Link to comment Share on other sites More sharing options...
Vaughan Posted August 7, 2022 Report Share Posted August 7, 2022 With the exception of Aux 5-8 which can do high side on some ECUs, all outputs are low side switching, the 12v you are seeing is a weak pullup on the output while the output is floating and isn't strong enough to trigger a relay. Have a look at the 'Wiring Information -> Output Wiring -> Auxiliary Output Wiring' section in the help manual. Quote Link to comment Share on other sites More sharing options...
borkenmotor Posted August 9, 2022 Author Report Share Posted August 9, 2022 Thank you for the help, before I go and undo my wiring, Its an E36link, so I just want to confirm that output 4, 6, and 8 are all low side, as these are the three that I will be using. Thanks Quote Link to comment Share on other sites More sharing options...
Vaughan Posted August 10, 2022 Report Share Posted August 10, 2022 From memory the E36 pnp didn't have the high side driver fitted so yes they will be low side only Quote Link to comment Share on other sites More sharing options...
borkenmotor Posted August 10, 2022 Author Report Share Posted August 10, 2022 Sweet, thanks! Quote Link to comment Share on other sites More sharing options...
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