Yesterday I instrumented the glider 12V power bus with a digital
voltmeter (DVM) so I could independently measure bus voltage if I
experienced another intermittant CAI-302 shutdown. Of couse, the 302
worked perfectly the entire 5-hour flight and its voltage reading
matched the DVM the entire time.

However, upon landing I ran across some minor ruts on the rollout,
experiencing some fairly sharp bumps. When I stopped, I noticed the
302 had turned off. When I turned it back ON, its voltage reading was
7.7V while the glider 12V power bus stayed at 12.5V.

Today I had the glider out of the box to inspect the power & signal
wiring.

Attempting to replicate the 'sharp bumps' from the previous day's
landing roll, I smartly rapped the 302 with my knuckles on the left
side of the unit, and it instantly shut down - yikes! However, I was
only able to do this once.

Nothing was obviously loose, but I removed and re-seated the 10-pin
power connector anyway.

One last thing. After reading the manual, and seeing another poster
say the factory had recommended he change the power input from pin 2
(switched power via front panel button) to pin 1 (powered directly
from glider bus), I switched my setup from pin 1 to pin 2.

So, the only things I know for sure at this point is that the low
voltage readings displayed by the CAI-302 are NOT due to low glider
battery voltage, that there is no obvious external wiring issue, and
that rapping the unit smartly is not recommended ;-).

Anyone have additional suggestions/thoughts?

TIA,

Frank (TA)