30 amps each? Holy crap! I don't get it. Maybe you had other electrical issues. Many Supras have electric fans. What gives? I have installed electric fans on multiple F-bodies, Vettes, Eclipses, etc., and never had any electrical issues. I absolutely REFUSE to spend lots of money on an upgraded alternator. For 1/3 the price I would adapt a high-output GM alternator if I had charging issues. Why is the Supra such a pain in the ass?
we here in the Bay area have 2 supras running eletric fan. i'm one of them. The other supra ran the eletric fan for more than a year now and he had no problems with it. he didn't have the power house alternator upgrade either , but we do use the optima deep-cycle yellow top battary on our cars.
I am in the bay area and I also run a electric fan with single turbo upgrade. I put it on myself and it's the biggest this company makes, supports V8's over 500HP.....Model #3716 from Pep BOys(not sure the manu.)...I had to fabricate some brackets for it, but other than that it runs great, mine only draws ~12 amps...and I have it wired in an ignition source under the dash....stays on with turbo timer. I have never over heated at all..stop and go, or highway...I like it. Contact privately for pics...