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I just want to comment on the current draw #'s...
Holy soda crackers Batman!
Trying to find a 75A+ relay is encroaching on the realm of "soleniods."
It's going to be difficult to find a quality relay rated that high from most common electronics parts vendors.
If you do find one, I'd bet it'll be pretty expensive too?
I was looking around for a 50A rated relay recently, and I ended up with an NTE one (Made in China) for about $10.
34A of current is a lot of juice for a single fan.
I'm sure there's other, aftermarket fans that'll run almost the same airflow for less current - i.e. more efficient.
We're talking minimum wire thickness at least 10AWG...8AWG?
Of course, you can't beat the price of a used fan...
But it looks at this point that the fan is faulty, so gambling with used equipment comes into play now.
-Ted
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