center positive wall wart question

[Robin]

I have a few 9 and 12v dc (center positive) wall warts and would like to use them with standard barrel jacks. I realize these normally closed jacks simply take the positive battery terminal out of circuit when the adapter is plugged in (using the outer part of the jack barrel). If I were to wire one for center positive use (bat+ to ckt. and bat- to normally closed jack terminal), then plugging in the adapter would take the battery negative out of circuit but leaves battery positive still connected. What problems would this cause?

[Robin]

I wouldn't  be using this with the power-switching-on-the-input-jack scheme. (Sorry -- couldn't find the "edit" button)

[Rob Strand]

If you don't use the wall-warts for anything which need the positive on the inside, just re-wire the 2.1mm plug so it has positive outside.  Having both non-standard wall-warts and non-standard effects kicking around is just asking for trouble in the long term.

[Robin]

Yep, the obvious overlooked again. Thanks, Rob.