Ducman82 Posted May 29, 2018 Report Share Posted May 29, 2018 I am wiring in the O2 sensors to a Thunder ECU. I have the 5 wires per sensor wired up, but I am confused on the "MAIN relay +,-, and Ign switch" connections. are they for powering the Heater elements on the Thunder ECU for the o2 sensors? im thing to figure out where to fuse the sensors and if the power is done IN the Ecu? I have the quick start guide, but don't see any comprehensive manuals in the help section. thank you! Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 30, 2018 Report Share Posted May 30, 2018 The +12V for the Lambda probes needs to come from an ignition switched supply. Typically this would be either its own relay/fuse, or you could possibly connect to you main ECU supply relay if you haven't got too much current going through it already. Two different variations of the Thunder main relay wiring shown below. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.