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Originally Posted by HUMMERcustoms.com/TAZ
The GM HD fan kit has to have wiring harness from Nelsonperformance.com
It will come with info on connections.
TAZ
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or you can get just the plugs and use a stand-alone fan controller. Try SPAL or Flex-a-lite.
The way I understand the harness from nelson, you need to flash the PCM in order for it to work. [I could be wrong, though]