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Finishing up a headgasket and EGR delete on a 2003 California LB7. Cant figure out what this hose does, where it goes, what fluid it even is??? Any help would be greatly appreciated so close to getting everything back together. Can provide more pictures if something specific would help. Hose runs underneath harmonic balancer to the passenger side. Has an oring on the end. Possibly blow-by tube? Tried to follow it and it feels like it goes to the positive battery terminal which doesn't make sense.

Thanks!
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I have a LB7 as well, but its not a California truck. I'll check mine to see if mine has it later and get back with you if you haven't found an answer yet. I'll also check my brother's LLY.
 

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Thank you for the replies! It goes into the alternator bracket to redirect the pcv waste. Must have come out when I pulled the bracket off. Problem solved. Part #7 on the attached diagram for anyone else.
 

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