I just picked up a canonet ql17 G-III from ebay. My first rangefinder. I put a brand new battery in it that is supposed to be for this camera, but when I push the battery light button nothing lights up. And the metering needle inside doesn't move out of its position just below 5.6. (Not to mention it needs new seals ... BAD). I know the shutters are mechanical and seem OK. How can I verify if this camera has electrical problems (maybe the bulb is out and maybe I just don't understand how the meter needle is supposed to work, or maybe the battery is the problem) and if so what can be done?