Series 2 tv175 anyone had this

Went to start it yesterday no luck. Looked at it today no spark. Eliminated ignition switch. Nothing coming out of stator green wire. Checked points opening and closing at right times. Just getting ready to take off flywheel. For some reason decided to read the bible (stickys) one sentence said on early TVs engine is earthed through brake peddle if brake light goes engine cuts out. Oh well I'll have a look. Took out bulb checked it all ok. Put it back together kicked it over big blue spark.
Problem now is not having fixed anything is it going to stop again.
Problem now is not having fixed anything is it going to stop again.