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Old 03-21-2010, 06:51 AM
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How do I reduce current for an Air/Fuel gauge?

I have an Air/Fuel gauge and it is hooked up to the oxygen sensor that needs a maximum of 1-volt. Currently the oxygen sensor gets voltage off of the car's computer so it's working fine, (this is the signal wire).

I am planning on disconnecting the ECM so I'll need an alternate source of voltage. Since vehicles runs on a 12-volt sytem, what can I use to reduce the voltage required to run the O2-sensor and gauge?

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Old 03-21-2010, 08:04 AM
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Quote:
Originally Posted by Black Buick
I have an Air/Fuel gauge and it is hooked up to the oxygen sensor that needs a maximum of 1-volt. Currently the oxygen sensor gets voltage off of the car's computer so it's working fine, (this is the signal wire).

I am planning on disconnecting the ECM so I'll need an alternate source of voltage. Since vehicles runs on a 12-volt system, what can I use to reduce the voltage required to run the O2-sensor and gauge?
Unless it is a heated O2 sensor, it does not get voltage from anywhere. It actually generates the voltage and feeds it to the computer. The O2 is like a battery that uses the exhaust gas for electrolyte, and the Oxygen content controls the output voltage.
Just as a side note, most stock O2 sensors are narrow band and will not work properly with an A/F gauge. Most require a wide band O2 sensor
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Old 03-21-2010, 08:55 AM
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Thanks! Now I know how it works.

Well it's not a heated 02 sensor, (the gauge's instructions state that a heated sensor is not nessacary unless one wants instant readings upon vehicle start-up).

As far as a wide band O2 sensor, this gauge is made to function with stock 02's, (it is not meant to be highly accurate).

So, all I have to do is find the signal wire off of the O2 sensor and the gauge should work?
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