jamiecroton Posted December 30, 2017 Report Share Posted December 30, 2017 Hi guys im new to tunning and doing a Atom in a jet boat running a 1UZFE. the issue i have is my outputs will not switch a relay. For example I have Aux 3 set up as Fuel pump, It is also setup to be a standard fuel pump (off in the pclink). I have 12v coming out of the out put on my DMM when i turn the unit on (i have a 4sec prime setup) but it will not switch the relay to power the pump. Batt at pin 30 fuel pump 87, ECU output 85 and earth on 86. do i need to do something different to make work ?? Thanks Jamie Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 31, 2017 Report Share Posted December 31, 2017 Aux outputs are “low side drives”, this means they switch to ground when “on”. 86 needs to go to ignition switched +12V. Quote Link to comment Share on other sites More sharing options...
jamiecroton Posted December 31, 2017 Author Report Share Posted December 31, 2017 Thanks Adam , So i need to change the ploarity to High or low ?? Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 31, 2017 Report Share Posted December 31, 2017 Polarity would be low for a fuel pump with a normally open relay if wired as above Quote Link to comment Share on other sites More sharing options...
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