Rob,

 

>>what's the difference between "case mount"
and "boss mount"

 

The Lycoming cases that don't have a mounting pad cast in the bottom of the case for the alternator bracket require the alternator bracket be bolted to the case halve bolts.  Hence the name "case mount".

 

The Lycoming cases that do have a flat mounting pad cast in the bottom of the case for the alternator bracket are drilled and tapped ready for a bracket to be bolted on.  Hence the name "boss mount".

 

Obviously the brackets for each style are different.

 

My engine is a very early case, "case mount", so I made the appropriate alternator brackets (I utilize the 40 amp alternator model.  The 60 amp would not fit under my cowl anyway).

 

>>the non-blinking Nav lights (the red, green and white
bulbs) have to be accounted for separately.

 

I have the strobes and nav. lights each on separate circuit breaker switches.

 

Gary Edwards

LNC2 N21SN