Dean Posted May 16, 2021 Report Share Posted May 16, 2021 Hi everyone, I've done a bunch of Astra pumps before, all being triggered via a relay. No problems doing it this way. 12V High current directly from alternator (fused) GND to chassis 12V IGN 12V ECU/relay trigger above 300rpm I'm just about to begin a loom on another car and am trying to limit the amount of relays. Am i able to trigger the PS pump directly from the AUX output high side driver? How do I work out how much current the PS pump switch draws to make sure it's within the ECU limit? Cheers! Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 16, 2021 Report Share Posted May 16, 2021 If it has a small trigger wire then it will likely be ok connected direct to an aux. Most multimeters have a Amp setting so measure it first on the bench to confirm. High side drives can only do 0.5A continuous. Quote Link to comment Share on other sites More sharing options...
Dean Posted June 15, 2021 Author Report Share Posted June 15, 2021 I finally got around to measuring this. I hope I’m doing it right. I removed the relay put the multimeter on the 30 and 87 slots. PS pump started up, but it barely read any load, like almost nothing (I tried all of the Amp settings) I guess that’s a good sign? Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 15, 2021 Report Share Posted June 15, 2021 SO yes, that suggests it will be fine connected direct to ecu. Dean 1 Quote Link to comment Share on other sites More sharing options...
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