I may have a lead on a cheap Mark VIII fan. I dont have the money to upgrade the alternator right now and was wondering if it is at all possible to run this fan with the stock alternator? Thanks.
tmoss said:Bes ure you know which fan your getting. The T-bird, Taurus and others look just like it (same frame and fan) but probably use different motors. I just measured my TB/Tauras fan last night on low & high speeds - 11amps and 17 amps.
BlackGT89 said:According to this Ford Muscle article http://www.fordmuscle.com/archives/2001/03/paperformance/index1.shtml , the stock 2G alternator only puts out 30 amps and 11.78 volts at idle, while the 3G they tested put out 75 amps and 13.77 volts at idle.
They were testing a bad alternator. If it doestnt put out 13.5=14.5v at idle, it is no good. Thirty amps at idle is pathetic. The 2G is a 75amp alt. ususally. Mine will put out 65 amps at idle if I turn on everything, and still be at 14v. If I turn everything off but the engine, it will only put out 25amps. You will only get the amperage you are calling for, so you can make the alt look good or bad depending on what you are running.
Oh, and dont try to run that Mark VIII fan with the 2G, thats suicide for you battery and could start a fire.
jerry beach said:I get 10.8amps on low with my taurus fan, but 28amps on high, with a nearly 60 amp start-up. Yours is only pulling 6 more amps on high, that doesnt seem right to me.
tmoss said:Well, could be Jerry. I used some heavy cable and a 15amp/50mv shunt (biggest I had) to measure the current. The high speed exeeds the shunt rating, but I would think the shunt curve would be close enough to linear to get closer than that. I got 58mv on high and I think 35-36mv on low.