Very simple job. 1.8 l engine.
friend asked me to change the plugs for her. No problems . Easy job.

now the car will not start. Just clicks like dead battery. Battery has 12. 35 v. Tried jumping it anyway, still just clicks. What the hell happened?

 

are the lights on the dash coming on? did you unplug the battery before changing the plugs?

 

had something similar happen once, for what ever reason there was lose connection to the starter. check the power cable from the battery follow it to the starter and make sure connections are secured.