Hopefully okay to post in this forum, I figured with the question regarding the gauge wiring, maybe the General Tech forum was better than the Tuning Forum.
I'm installing the LC-1 and DB Gauge in my '89 325is that is running the original Motronic 1.3 ECU. For now.
Two basic questions:
1) I found this courtesy of blueapplesoda:
Wiring scheme is
Pin 1 - Sensor Ground (Grey) -> LC-1 White (sensor ground), one end of button, black pigtail of LED
Pin 2 - O2 Signal (Black) -> LC-1 Yellow (output 1, default narrowband output)
Pin 3 - Heater Ground (White) -> LC-1 Blue (system ground)
Pin 4 - 12v From o2 relay (White) -> LC-1 Red
You will be left with a Black calibration wire, the red pigtail of the LED, and the other end of the momentary button. Connect the three (crimp/solder), and insulate it and stuff it away.
So, is it okay to to eliminate the narrowband 02 sensor entirely and run the Motronic ECU from the wideband 02 if I wire it as shown above?
Or will I run into a host of issues? I've read opinions saying yes and no. It would be nice not to have to weld in a second bung and add all that extra wiring.
I understand also that I'd have to alter some of the output settings to make the Motronic ECU happy... could anyone elaborate?
2) When wiring up the DB Gauge, I would like to know where to tie in the red (12v power, ignition switched), black (ground), and yellow (display dimming) wires that will give me the cleanest and best quality installation. Final gauge placement is undecided, but likely in the center of the dash/console area. So where should I best tie in to switched 12v power and a dimming source?
Messing with and adding wiring always makes me nervous, I'd like this to be neat and clean!
Thanks!
I'm installing the LC-1 and DB Gauge in my '89 325is that is running the original Motronic 1.3 ECU. For now.
Two basic questions:
1) I found this courtesy of blueapplesoda:
Wiring scheme is
Pin 1 - Sensor Ground (Grey) -> LC-1 White (sensor ground), one end of button, black pigtail of LED
Pin 2 - O2 Signal (Black) -> LC-1 Yellow (output 1, default narrowband output)
Pin 3 - Heater Ground (White) -> LC-1 Blue (system ground)
Pin 4 - 12v From o2 relay (White) -> LC-1 Red
You will be left with a Black calibration wire, the red pigtail of the LED, and the other end of the momentary button. Connect the three (crimp/solder), and insulate it and stuff it away.
So, is it okay to to eliminate the narrowband 02 sensor entirely and run the Motronic ECU from the wideband 02 if I wire it as shown above?
Or will I run into a host of issues? I've read opinions saying yes and no. It would be nice not to have to weld in a second bung and add all that extra wiring.
I understand also that I'd have to alter some of the output settings to make the Motronic ECU happy... could anyone elaborate?
2) When wiring up the DB Gauge, I would like to know where to tie in the red (12v power, ignition switched), black (ground), and yellow (display dimming) wires that will give me the cleanest and best quality installation. Final gauge placement is undecided, but likely in the center of the dash/console area. So where should I best tie in to switched 12v power and a dimming source?
Messing with and adding wiring always makes me nervous, I'd like this to be neat and clean!
Thanks!
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