When I upgraded my condensor fans, I had to upgrade the alternator too. I went with 100 amp. Believe it or not wires can wear out, As the current runs through it, the electrons eventually build resistance. I had a Corvette with a hot start problem, and when I replaced the wire to the solonoid I noticed it was stiff and actually brittle. I realize we are talking about radiator fans, but same difference. BTW< I also pull air in from the rear so as not to suck engine heat and push out through condensor.
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