On my 1999 C2500 Suburban 5.7 the O2 sensor wires are paired purple and tan and paired purple/white and tan/white. Does anyone know which is the positive from negative ie, the purple or the tan?
Is it safe to check continuity to ground with a multimeter to find the negative one - or can I fry the ECU doing that?
(I'm trying to install an AFR meter and need to know the polarity as it's a one wire hook-up).
Is it safe to check continuity to ground with a multimeter to find the negative one - or can I fry the ECU doing that?
(I'm trying to install an AFR meter and need to know the polarity as it's a one wire hook-up).