![wtf :wtf:](./images/smilies/icon_wtf.gif)
So over the years I have built hundreds of custom engine harnesses and have always followed manufacturers diagrams for earthing of various engine sensors, coils, etc... and have always been of the belief that certain sensors create electrical noise that could effect the signals of other sensors sharing the same earths.
So recently I built a custom harness for a bike running a M130 motec, the harness I was replacing was a 'milspecwiring.com' custom harness (that cost thousands) and I noticed that the ignition coils (inbuilt igniters so sensor earth and chassis earth) where earthed together and terminated at the engine block.... So I went against what I know and copied that, we found no issues with the bike or ignition system or other sensors.
So I suppose my question is, when sensors are earthed at the ecu, is there some circuitry that prevents noise from effecting other circuits? Why would a well known harness maker not use them?
Thoughts?