This thread has been a wealth of information so thanks to everyone for contributing.
I have a Terminator X Max ECU, C6 fan, and Dorman 902-310 relay (mopar relay). I have tried a few different frequencies and have settled on 128, but there is a pretty noisy buzz from the fan. At 50% duty the fan and buzz noises are about equal, but below 50% the buzz is a bit annoying. Does the C6 relay have the same buzz? Anyone think it’s the mix of the Dorman relay and the C6 fan creating the buzz?
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