I'm not sure how well this fan fits 3rd gen F-bodies, but know the rad is roughly the same size as a g-body so I thought share in case anyone is interested. After finding out that the Mark VIII fan was too much for the SPAL V3 to handle, I decided to scrap the whole controller idea and make up my own harness/diagrams for a hopefully trouble free system. I designed it so that it operates much like an electric fan in newer cars. It also has a high speed manual override switch, as well as feedback through a single RGB LED for the various states (high/low/AC).

Here's the final schematic and wiring diagram I designed:


Mark VIII fan installed:

 

Relays/custom harness wired up and ready to go:


(figured I may as well make use of the Maxi-fuse holder from a painless 70A wiring kit I decided not to use)

Relay rack fits nice and snug next to battery (one more relay was added for proper LED control due to fan motor feedback on opposite speed):

 

And finally here's the LED in the different stages (mounted at manual override switch/temp gauge):
Off:

Low Speed:

High Speed:

A/C:

It will be nice to finally have a trouble free, fully operational fan setup - beats the unreliability of these worthless controllers out there!

 

I know this is old but has anyone tried this? how reliable?

 

ttt