Help! '78 2+2 won't start - electrical

[broomball]

My '78 280z 2+2 would not start yesterday even with a jump. Not a noise from the starter or the open door buzzer or anything. Dead! A week ago this happened and it started with a jump then worked as if nothing happened. I immediately turned off the car an it restarted again and again. But yesterday it didn't respond to a jump. I took off the leads to the battery, which is new from last summer, and cleaned them then tried to start it again but no luck. I tried hitting the solenoid with no success. I did notice that the amp meter did slightly move negatively as I turned on the key but that stopped after trying to jump the car. Any help would be greatly appredciated. Lou

[beandip]

check the ground wire . If you have connected a charged batt to the car and get nothing , you have an open circut. Start with the batt cables are they croded , some times even down inside the plastic they are bad , take a close look. check the fuseable link and see if it is good. and the main connections. try connect the jumper hot wire to the hot connection on he starter and the neg from the jumper to the neg batt terminal and see if that helps. that will tell you if the cars + cable is bad. If nothing then connecet the jumper - cable to the ground and the + to the batt and see if the cars - cable is good. That eliminated check the fuseable link with a continunity meter and see if it is good . With an intermittent open like this you just need to keep checking and moving connections and then trying to start the car eliminating possabilities as you go. there should be a ground wire from the engine to the body most likely the firewall be sure that it is in tact. I hope I have given you some ideas to work with , all the best Gary