So I installed a 3g alternator with the proper wiring in May 2012. I followed jrichker's write-up, used 4 gauge power wire from the alternator fused with a 150a fuse, and also upgraded my ground wire from the block to frame rail with a 4 gauge piece. Everything has been working flawlessly until yesterday. I started the car in the driveway and let it idle for a couple minutes while I ran back inside. Came out, got in the car, started to pull out of the driveway and noticed a little bit of smoke coming from the driver's side of the hood, where the fuse is installed. This is what the fuse looks like now. Did the fuse just fail and I need to replace the fuse and fuse block with a new 150a unit? Is there something else at work here, like a bad ground somewhere? I've looked around and can't find any bad grounds, but this is obviously I huge safety issue so I want to make sure I get this diagnosed and fixed properly.