S5 alternator to S4
 

Yes the title is typed right and I do mean what it says. I searched and came up with absolutley no luck. My friends S5 GXL alternator went bad, I have 4 spare S4 alternators and was going to put one on for him even though its 10amps less. Before doing so I noticed the clip on the back of it is different than the S4's. I know he should really just buy the right one but with so many spares I have and the price im giving him I feel I should help him out, without him losing money. I just wanted to know if I could splice the wires,put on an S4 clip and hook it up to the S4 alternator. Is there anything that can go wrong, anything I should look out for? Sounds pretty dumb to me to ask these questions but I like to make sure of things instead of taking chances and making things worse.
Thanks for any of the help or in put any of you have for me.
-Nick

That swap makes absolutely no sense whatsoever to me...modify the wiring and use a non-stock part to end up with less performance?
Most people already consider the S5 alternator to be marginal- hence the popularity of the FD swap- I just can't see how even a killer price justifies going in the opposite direction.
If you really want to help out your buddy, loan him the money to either replace his stock alt or upgrade to a better one.

is it a straight bolt on for the fd alternator swap into an s5?

After the pulley is swapped, yes.

It does make sense. I have a lot of spares that i dont even need or want to sell. Im helping by making him spend a lot less than a shop would do it.(he dant do anything on a car) And also when ever it goes bad again....I will have others to swap for him. It helps him in the long run, so I just if anyone can awnser my questions I posted before that would be great. Thanks so far for nothing, Nick

OK, here's something.
If you search for S4>S5 alt swap, you should be able to just do the reverse.

Here's something else...A Link.