CJ7 no power

I have an 80ish cj7 I've owned a 7 since 1991, mine was flooded in katrina in 2005, bought this one to replace her in 2006 and it has some issues patched and mismatched together by previous owner-recently I began having starter issues finally got it resolved-dont really know what fixed it exactly but its or was starting. I was attempting to start it to move it, and its been a few weeks so it takes a couple tries to start. Well I pumped the pedal and was turning over when sounded like battery getting low (i only try a few seconds at a time dont want to burn up starter and usually cranks after a couple tries and some pedal pumping)so I stopped for a few seconds then turned key to try to start and NOTHING no click, no lights, headlights wont come on, nada, volt meter doesnt move its completely dead. I have had this problem once before and a mechanic friend of mine did something under dash and pow started working again-i have no idea what he did but it only took a minute. As a note the key is broken in the lock-but its been like that. I did put the other half into ignition in case that was it but it didnt make a difference. It was turning over fine and then zip like a switch shut off. I just replaced my negative cable about a month ago it was bad-all connections look good-i wiggled and tugged coil wires, starter wires and solenoid they all look fine. Its been very cold here 20's at night so I have since charged battery with a charger, and retried and still zip, headlights wont come on and no power any where. Its a new starter new coil new solenoid-new carb too its just kind of finicky I guess needs adjusting when I first put it on didnt need to pump at all. So any suggestions? Thanx for your time Rita Adams Bay st. Louis ms