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  1. Hello everyone, I'm new to this forum ,is the second time that I install a link ECU, first it was to my university project which you give to us a link G4+ ATOM like sponsorship for Tyφοοn Motoracing Team. After that I buy a Monsoon for my personal car bmw e30 m42 but the wiring now is a little more difficult. My problem is the wiring of main relay because the Motronic 1.7 send a ground to pin 85 (27) of main relay which have supply from ignition switch input (56). Also the OEM ecu have an input from pin 87( main relay)(54) and a battery voltage input (26). (there is attached image) My first thought was to use one more relay to use the ignition switch(56) to give ground to 85 main relay (27). And take +12V for monsoon from pin 87 main relay(54). After that I find to forum a diagram that use a Mosfet transistor and a diode to do exactly the same job. although, I do not understand why he use diode to connect the to side of relay 85 and 86 (image ) There is other solution to my problem and what do you suggest? thanks you for your time! Peter MS
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