I’d take a look at tuff stuff alternators. I bought their 130 amp 3 wire square back, just like the original one. It has 65-70 idling amps. I’m running a BeCool dual fan set up, AC and so forth. Have all new factory wiring, I do not use the ammeter as I have Dakota gauges. I also ran a 8 gauge wire from the alternator to the battery as suggested by Nacho, he also said I could run it to the starter relay but I chose the battery. It absolutely works perfect. Here’s a Summit part # TFF-9509DP. Dual Pully just like you need. Those guys are up in Cleveland if you want to look them up and give em a call.