Today at Ugly Truck, we're wiring up the factory electric cooling fans on this 2004 6.0 LS swap. This donor didn't come with the option for electric fans, but a 2005 did. With the help of some wiring diagrams, we steal power from the OEM underhood fuse box and, using 3 relays, we wire up the fans in series and in parallel. The series circuit will run the fans on low, the parallel circuit runs them on high, and it's all triggered by the PCM... Just like it did on the donor.

Here's a link to the FANS we used: https://amzn.to/3rKniB0
Here's a link to the PIGTAILS for the fans: https://amzn.to/3tuhlZu

**We found a complete harness kit for these on Amazon! Check it out! https://amzn.to/3TZuyo8

Wiring LS swap air conditioning through PCM:    • CHILL OUT! - How To Wire LS Swap A/C ...  

For more helpful LS Swap videos, click here!    • LS SWAPS - Tips & Tricks - UGLY TRUCK...  

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