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Old 04-05-2021, 10:44 PM   #2
Dirty Rick
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Join Date: Apr 2013
Location: Cornholio, OR
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Power ground is a good engine ground you can't get much closer to the battery negative than the motor.

The power source for the O2 controller should be separate from the MS as well because the O2 controller uses PWM to control the sensor heater and are inherently noisey. Plus the O2 heater should not be on unless the motor is running, so I grab power from the fuel pump relay as that shuts off when the motor does.
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