"Kyle Boatright" wrote:

Interestingly, someone sent me a private e-mail indicating that he had
the same problem with his Lowrance Airmap 100. He resolved the
problem by trading up to a newer unit. ;-)

Reading through the Airmap's manual, it is supposed to switch to the
ship's power if the voltage from the ship exceeds the voltage of the 4
AA's, which is roughly 6 or 6.5V. There shouldn't be a problem with
the power from the airplane. Its voltage is ~14, and the circuit is
fused for 10A and wired for 15-20A. I've checked the voltage it on
several occasions.

My guess is that there is a problem with the internal switch on the
Airmap, and that I can't solve it on my end.

I guess I'll just have to keep feeding the thing AA's.

Check to see if there is a fuse internal to the plug power adapter. It
might be open...