10 amps? Is that a typo? I can't imagine 10 amps - that's 120 watts at 12 volts. 120 watts would mean generation of considerable heat, you should smell something smoking.

In any event, go to the link below and get V3 of the full procedure. I go into extensive detail about how to go about this.
https://www.crossfireforum.org/forum...lp-papers.html