BB, I replied to this post earlier however the forum remains erratic. The Quicktifier operation is best reviewed by a google search. It does work and is a really good device to lessen the load on your alternator electronics.

The issue is 100% me - I screwed up on the wiring, didn't pay attention in the usual whirlwind of my available timeslots to do things, and paid the price with poor reliability and a confounding problem that was simply masked in not paying attention.

If you have an alternator operating in elevated temps with consistent high current demand, this is a solution. @MB has one fitted to his Chev powered GU and it resolved the issues associated with high current cooling fans for him. I have run the Quicktifier for maybe 6 yrs and its been trouble free. Anyway the lesson, another one, is to slow down and concentrate - the problem was simple to resolve and now its on to focus on the final area of optimisation - W2A intercooler optimisation.