Honda Civic Won't Start (Sometimes!)

[George_San_Jose1]

If you want a full blown diagnosis, the quickest way to a no-crank sol’n assuming the obvious stuff has been ruled out already like the battery and the battery connections is to probe the two starter motor terminals, the thick cable one and the thin cable one. Both should measure 10.5 volts or more when the key is in “start”. If they do, and it doesn’t crank, replace the SM. If one or more is less than 10.5 volts, work backwards towards the battery to find out why. Having access to a wiring schematic is somewhere between very helpful and required for this task.