i got a wideband and want to put in a 10W-25k resistor for the o2 sensor positive heater wire.

I have a 00 Si converted to OBD1, p28, but im putting the resistor in the obd2 harness o2 sensor heater wire.

The positive heater wire is C1
And the 2 grounds for the o2 sensor are C7 and C18.

Do i throw the resistor into the positive heater wire only,
or do i loop the positive heater wire and negative heater wire with a resistor??

Sorry, i did a search and couldnt find out the correct way.

thanks for any info.