Question: LS3 fan control wire; power or ground?

[DT69Cam]

Originally Posted by Gmachine1911

I’m looking at purchasing the Entropy fan controller but I do not want to run their secondary temperature sensor. On my LS3 crate engine with the GMPP harness, does the single blue fan wire send 12 V or a ground signal? I’m sure. this has been covered in depth already but after numerous searches, it is evading me. Thanks!

I purchased the Entropy LSX fan controller kit. Super easy to install. Plug and play essentially. Absolutely love the 2 speeds. I did not use the GMPP blue wire. I just capped it off. I'm also using their radiator.