Adding a ground strap from radiator to chassis

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).