Moby said:The problem is that FJ-62s idle at 650rpm and ~800 with the AC idle up circuit on. I'm running a Mechman hot rated 175 amp alternator (custom built with heavy duty components in a Ford case) with a custom ground pulley (turned undersized) to get better idle output. The fit is a little tricky. I just had W at Over the Hill build me a custom top bracket that works better. The case, however, is much smaller than the stock unit which is kind of nice. I'm also running dual yellow top batteries with 1/0 guage cables on the positive and negative sides. Both batteries are grounded directly to the alternator. Mechman puts a ground stud on the alternator body itself which is also kind of nice.
At idle I generally get >13 volts unless I've got a lot of accessories on. At 800 rpm I get >14 volts and life is good. As part of moving to an electric fan (which should show up any day) I'm going to rig the AC idle up to trigger whenever the fan or headlights are on. My headlights (H4/H1s) are rewired and see battery voltage -.03 volts so when the alt is kicking out 14 volts my headlights rock! This is a real bonus in Seattle weather
Hey where in Seattle do you live? I'd like to see the setup you've got in your truck while I'm home on my comp time if you've got a chance. PM me if you'll be in town.