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I've been running a powermaster 140 amp for over 6 years. It's a one wire and I have had no issues at all, It came with an actual test sheet too that showed it put out over 80 amps at idle too. I did have to grind a little on my stock bracket to make it fit though.



I too run a high amp powermaster for fans, aftermarket ign, as well as being able to add on more electronics in the future.
At idle with the fans on, Serious radio going, lights on and GPS plugged in It doesn't skip a beat.
I've been running it trouble free for many years now.