hi all,
I have an older style Motorola 2900 carphone that is no longer installed in the
car.
is there a way that I can power the phone up (without first installing
it in a car) to check that it is working?

There are a few wires hanging out of it - and i gather the red and
black are positive and negative respectively - but what can i connect
these too, to give it enough juice to power on, but i don't want to
damage it...

What voltage do one of these things run on?

thanks.