How many amp Alt needed with Jeep fan mod?

[71meangreenc10]

Originally Posted by RichardJ

First he needs to find out if he needs a bigger alternator. A bigger alternator will not give a lower Amp reading.
Only if the alternator can't supply the proper voltage at the battery would he need a larger alternator.

I don't know what " Jeep Fan mod" he is talking about. A 30 Amp fan would only draw 30Amps at startup for 1/2 second, then drop to 15-18 Amps.
Need to know battery voltage before and after fan kicks in and how it is wired. Would also be nice to know the specifics of the SI installation wiring.

Here is the Mod RichardJ.

http://67-72chevytrucks.com/vboard/s...d.php?t=254617