Bypass only works when battery isn't connected

[Ripthorn]

So I am finishing up a project and I plugged in to see if it works, but I got nothing.  I checked connections and everything.  I am using a stereo input jack with a battery and dc jack wired in the usual manner.  Output jack is mono, switch is just a dpdt that I just got today.  The weird thing is that as soon as I unplugged the battery, the bypass worked.  Anyone seen this before?  I can't figure out why it would do this because I wired up the dc jack, input and output jacks and the switch the same I as I have on all my projects up till now and never seen this and it's just really whacking me out.  Any advice?

[Ripthorn]

Am I the only person to have had this problem?  I have discovered that it also happens when I use the DC jack.  This seems to indicate that there is some kind of short, but I am getting no continuity at all between the tip and sleeve (or tip and ring) of the jack, meaning it seems as though there isn't any connection from signal to ground.  Obviously I am missing something, though.  Thoughts?

[drewl]

Is a ground connected wrong or being lifted by the dc jack?

[slacker]

I think it's pretty much got to be a wiring error I can't figure out exactly what though. I'd try measuring the voltages on all the switch pins and jack connections with and without power connected and see what's different that should pin it down.

[Ripthorn]

I found that I was getting voltage on the output jack, so I tracked it down, it was a problem with the ground that wasn't really a ground.  Stupid little mistakes, I tell ya.  Thanks for your input guys.