I’ll agree with the old wiring sucks or any old wire period, especially for accessories. The new M&H harnesses are Cross Linked Polyethylene type GXL wire which is much more tolerant to heat than the original PVC type GPT wire that was used from the factory and thats exactly why I went with it along that it’s also plug and play. You’re spal fans will only use that many amps on initial start up, 40 while they are running if there the high performance 12” fans. If you plan on running the AC in hot weather be prepared to put a pusher on the condenser as those fans won’t be enough to cool the condenser also at idle and that would be the only time you’d have to run it. Change to LED lights or the relay upgrade on the Halogens. Of course ammeter delete is a must. I have more electrical accessories than you and I’m using a 160/100 amp at idle 1 wire powermaster recommended by them. Run a 4 gauge wire from the alt to the batter post. I cant remember what gauge the wire is from the factor, from the battery to the starter relay but mines an 8 gauge. I don’t use any maxi fuses or any of that other crap. I use the factory fusible link from the factory and have zero issues. I’d call powermaster and tell them what you plan on using accessorie wise.
