you can use it.
that is what I run on my car.
just hook it up to one of the field ends on the alt and ground the other.
works just fine.
been running on mine for 2 or 3 years now.

put it through it paces earlier this year, and powered 2 of the mercedes fans with my system. melted off the end of the cable on the alternator side, but none of my other wiring had any issues.

HAd left it loose at the big bolt end. so it arc welded a bit.