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Well today I got an intermittent battery light so I got the batteries tested and they were both good and then the alternator is only pushing 12 volts so I guess I need a new one right? Which know should I get? And how hard is it to get the belt to relieve tension
I have the one in the second link, but for the alternator on the 6.0L you can really just lift the belt on and off the alt without messing with anything. Or use a pry-bar to lift the belt up and off like how is shown in Rusty's link above. But if you feel like you need to, either of those tools will help you set the tensioner kickstand (pics below) that keeps the belt slacked while you change out the alt.
If you live near a rebuilder, a repair can be a good option also. Save a few bucks and what you do spend is local. A 3G alternator is larger and can make more power. With a simple adapter harness they bolt in and are a higher power option for possibly less money. I put a 180amp 3G in my truck for $170 (IIRC). I bought it from a local rebuilder, all new parts including undersized pully to help it make better power at idle.
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