MaxouGT4 Posted July 17, 2022 Report Share Posted July 17, 2022 Hi, I have a my fuel pump relay (30 amps) that received a 12v signal from my TST205+ on Aux Output 7 (original fuel pump signal but not on ground anymore). If I test the voltage when the car is at "On"/not running and without relay I read 11.75V. If I back prob the terminal of the relay when the relay is plug I get 0.5V. If i remove the terminal from the ecu and try a direct 12.6V it works. Is it a normal behavior? I guess I could just change my signal to be a ground again a give my 86 pin of a my relay a 12v with a 2amps fuse but I'm wondering if it's normal. I've check the ground for the ecu and relay and I don't have any resistance. And what is the difference between Aux Output and Ign Output anyway? Thank you! Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2022 Report Share Posted July 18, 2022 The aux outputs in most of our plug-ins are low side drive only - this means they switch to ground. They are "pulled up" to regulated 12V when off but that is generally not enough to switch a device on that requires a 12V signal. Quote Link to comment Share on other sites More sharing options...
MaxouGT4 Posted July 18, 2022 Author Report Share Posted July 18, 2022 This what I thought! I wasn't sure. And if i understand correctly, the Ignition outputs should be battery/alternator voltage correct or it's again regulated? I will switch back to ground. Thank you! Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2022 Report Share Posted July 18, 2022 Ignition outputs are also lowside drive. Also only pulled up to about 6V. MaxouGT4 1 Quote Link to comment Share on other sites More sharing options...
MaxouGT4 Posted July 18, 2022 Author Report Share Posted July 18, 2022 Good to know! Thank you very much! Quote Link to comment Share on other sites More sharing options...
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