no power at all!!! wont start turn over nothing

2008 mazda rx8 with 43k standard bhr igntion system maintained to mazda standard

im getting no power to anything the battery is optima....it has randomly not had power when i go to start it 4 times in the 2 years i owned it. it started 8 months ago i just towed the car from washington to california and it happen today at winco the 4th time. everytime i i have this issue i literally wiggle wires near the battery and or tighten terminals one time and it worked. today did all the above and nothing. my igntion relay started clicking my dash started restarting. i replaced the relay and nothing. also i pushed in the clutch today and my cars electronics reset multiple times as if u restarted the car but the car maintained its rpms and mechanical dutys. it only happen in first gear. im about to take the battery starter and alternator to autozone for testing. i also ponder the theory of bad neutral safety switch.

no power to car all all with good battery

bad starter? alternator? battery? Neutral safety switch? anything please ill take all advice

 

Don't understand....Do you have power or not. You say that you have nothing. ...then talk about flashing dash lights and clicking relays.

 

so do u have power or not ?