Maybe you've got a bad GP relay. Mine is bad, but not so bad that's it's causing starting problems. If a relay goes bad though, there's really no telling how it could malfunction. It could not turn off power to the GPs when it's supposed (causing premature GP failure) or have a short causing a greater draw than normal leading to symptoms that would make you think your battery is bad (this is the problem I am having).

I think your next step after replacing the bad GPs (if they are indeed bad) is to get your hands on a GP relay that is known to be working and swap it out.

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-justin

1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon