I've encountered poor wiring on "real" Warwicks many times. That could be the same issue in this particular case.
On new basses direct from the factory or distrubutor?
I've seen the QC standards & poorly wired basses do not leave the factory,ever.
There will always be dealers (usually employees) that stuff around with these things & make a mess of things.I once told a shop's tech one of their basses needed a battery change & this "tech" decided the preamp was shot,without even reaching for the multimeter & doing any checks or first changing batteries.He swapped the dead battery pre for another,identical MEC pre & made it look like a blind chimp had done the work.The poor bastard of a bass went back up on the wall like that giving any unsuspecting potential customer the impression that Warwick do an exceptionally dodgy job at wiring.Not everyone would think,why would they source some of the best woods available in the world,ship them from Africa to Germany,assemble them using the latest,best & most technologically advanced machinery in the world(often designed & built by Warwick in-house),only to leave the back bone of the instrument(the electronics) in such a poor state of repair it puts any potential customer off the brand for life.
I dont wanna sound like an arse kisser mate,just wanted to set the record straight for everyone.
btw,we dont see you at the Warwick forum much these days.What gives mate?
Drop in & say g'day sometime soon eh.