Espar in cab heat

[Hipshstroke]

I had a shop install an Espar D5 in my '06, it works but I've heard that the fans in the cab should run. they don't! The shop told me I needed another part but he didn't know what part I needed. I thought it should just be a jumper wire to the . . . . ?! I could use any info.

Thanks

[IanThrones]

To the best of my knowledge you will need a different espar wiring harness that supports that option but it does put alot of draw on your batteries so I wouldn't recommend it personally I have heard of dead battery issues with it