Is it possible that your issue is also related to your "what is it?" post? Have you seen signs of other non-Porsche wiring? Here are my possible thoughts....someone might have installed a second (replacement) amp (under seat at or behind console), and the mystery wire from before is the amp ground (larger gauge red) and either the power or the remote (switched) lead (the one going to the fuse); or if there wasn't a second amp, it it possible they bypassed the original amp wiring? Did you finish running down the previous mystery wire?
From what I understand, you don't have a multimeter. I would suggest getting even a cheap one...at this point you don't need a lot of knowledge on multimeter operation, just set it check for either 12v or at least continuity...this will allow you to help sort out your issues.
Finally, regarding you battery vent line...I would think you would have a small nipple at the top sde of battery...line attaches there. Also, a good practice is to check vent line for obstruction (a quick blast of air works).
Best luck, if I can be of further help, let me know.
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