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Does adding a ground strap from radiator to chassis reduce coolant voltage to almost zero? I have seen most cars have between 0.1 to 0.2 Volt of coolant voltage. I want to test it by adding a strap to the chassis and see whether the voltage changes in digital multimeter screen or not. Do you have a similar experience? Most manufacturers isolate radiator from the chassis with some rubber mounts to stop vibrations and I think this increases coolant voltage. Please bear in mind that I'm talking about a healthy system (All negative grounds of electrical accessories are ok and coolant is not very old).

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  • That reading is most likely from the (cheap) meter...
    – Solar Mike
    Commented Jun 25, 2021 at 12:17
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    Ideal voltage is NOT zero . Ideal protection protection voltage for steel in soil is more negative than -0.85 V. Commented Jun 25, 2021 at 14:09
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    The "electrode potential" voltage between copper and aluminum is about 0.8V, and between copper and iron is about 2.0V. There is nothing surprising about measuring "random" voltages smaller than those figures between the coolant and ground.
    – alephzero
    Commented Jun 25, 2021 at 14:44
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    Can you explain how you are measuring the voltage?
    – HandyHowie
    Commented Jun 25, 2021 at 16:30
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    I have found sites suggesting this. They are talking about the the coolant becoming an electrolyte as it ages. Adding a ground strap to the radiator could make the situation worse. Best just change the coolant.
    – HandyHowie
    Commented Jun 25, 2021 at 20:00

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