Just thought I would throw in a data point here amidst all the relay talk.

Two weeks ago I had what turned out to be a stuck starter solenoid.  I had been troubleshooting my noise issue and had done a series of startups and shutdowns.  Four over 20 minutes or so.  On the last shutdown, I momentarily grounded the mags as normal and pulled the throttle and mixture.  Prop kept going….thought it was what we used to call dieseling.  Turned off mags…still running.  Fuel off.. still running.  Master off killed it.  Master back on turned prop again, and quickly blew the fuse on my Vertical Power system at the main battery.  I thought I had a problem with the dreaded starter adapter, but that looked OK.

I'll save the whole troubleshooting story, but it was indeed the starter solenoid.  2007 kit, about 90 hours total time.  It was a Hersee solenoid that I got directly from Lancair in the FWF kit for the starter circuit.  The part number was 24144 if my memory is correct (I do have a pic).  I looked it up on their website.  It was a continuous duty solenoid like you would use for a master, and not an intermittent as needed for the starter circuit.  It seems to really make a difference.  Someday I will cut it open to see what it looks like.

Gordon

ES N144GP