3 wire O2 question
Thread Starter
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
3 wire O2 question
I just recieved my 3 wire heated O2 sensors from Jeff Kopp. Outstanding considering that I ordered them on Monday! Anyway, I'm looking at them and I see 3 wires of course. Two are brown, one is purple. I assume the purple is the signal wire. That leaves the two brown wires. For all I can tell they are the same. Does it matter which way I hook these up? One of them needs to be 12 volts the other needs to be a ground but does it matter which one?
I'm thinking that it shouldn't matter. If it's just a resistive type heater it really shouldn't matter which way the current flows through it should it?
I'm thinking that it shouldn't matter. If it's just a resistive type heater it really shouldn't matter which way the current flows through it should it?
Drifting
Joined: Jul 2000
Posts: 1,661
Likes: 4
From: Phoenix, Arizona
More on 3-wire heated O2 sensors
Those that have done this - did you use a relay for the heated wires, or did you wire one straight to 12V source? Thanks in advance.
[Modified by NavyVet, 9:02 AM 11/21/2002]
[Modified by NavyVet, 9:02 AM 11/21/2002]
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: More on 3-wire heated O2 sensors (NavyVet)
Doesn't matter the polarity. I just ran mine to an ignition controlled 12v source. Wiper motor works nicely. I am planning on putting a fuse panel out under the hood for all the goodies.. :cheers:
Le Mans Master
Joined: Feb 2001
Posts: 6,398
Likes: 1
From: Loveland Co
Cruise-In III Veteran
Re: More on 3-wire heated O2 sensors (ski_dwn_it)
Doesn't matter the polarity. I just ran mine to an ignition controlled 12v source. Wiper motor works nicely. I am planning on putting a fuse panel out under the hood for all the goodies.. :cheers:
