Car wont crank/start!

[DualZ]

So my previous problem was that my#5 cyl was not getting any injector signal from the ecu so i got a new efi harness then a new ECU (whole unit) Now it seems to run smoothly. I cranked it up about 5 times. Started right up. Drove it for a few miles then got back home. Turned it off. two hours later i try to start it again and I get nothing. NO Fuel Pump Priming or Crank, just the clicking of the starter relay.

So here is what i tried:
-Starter relay bypass
-Checked fuses all where good but the ENG CONT (i replaced it)
-Checked battery terminals
-Checked starter wiring
-Bypassed Clutch Switch
I have had my car not start on the first try a few times about a month ago(last time i drove it), what i usually do is kick in the clutch a few times and it would start up. But now i get nothing.
Man this car is finally making me think about giving up on it !

[Howlermonkey]

Bad connection between negative battery terminal and either body or engine or both.

Check where it bolts to the body as well as the engine.

Of course it is very easy to check this with a pair of jumper cables by hooking both to the negative terminal (first checking it is making good connection to battery) and running one to the engine and the other to the body.