I would not have expected the EC2 controller to put noise into the supply line, but then again I have not put a scope on a running unit yet.  What level spikes have you observed? And should I consider a capacitor to absorb/dissipate potential spikes?  I used Schottky diodes on the supply lines ( due to the low forward voltage drop characteristics.)

Joe

Joe;

We are still trying to resolve the settings corruption issue, and have added a number of additional filters on the board, the effectiveness of which is yet to be proven.  Regarding the isolation diodes, I also have Schottky diodes between the batteries and the ‘hot’ bus that feeds the injector and the coil power to prevent a failure in one battery circuit from affecting the other.  It may be that noise propagated in these circuits being isolated from the battery is a more likely an issue than isolation of the power feeds to the EC2.

The reality is that after putting filters at the coils to kill spikes coming back from there, we do not see any noise levels on any pins expected to be of concern.  But since the problem still existed we assume that there are some spikes at times we didn’t observe; and in studying the circuits, and what is different in my setup than others; we are speculating that the isolation diodes could exacerbate the issue.  More will be known in a couple of weeks I as get some other changes/fixes completed, and get back in the air.  After a few low-power engine runs since the addition of the filters, there has been no changes of settings noted so far.

Al