Does your Beechcraft Alternator Out light flicker or come on and you confirm that your alternator is working just fine?

If it does this then you might have a cracked alternator out light printed circuit board. This circuit board is subject to all the engine vibration that occurs out there and has been found to have a tendency to crack.

Here's a fix for the circuit board contributed by Beech Lister Eric T.

Above is a photo of the repaired mini-PCB Board. The resistor is on the other side of the PCB.  The copper wires at either end were my add.
 

Initially I took the circuit board and checked for continuity and it seemed that the traces on the circuit board cracked causing the open circuit.  I then took some thin gauge copper wire, and soldered a loop from where the resistor passed through the circuit board to the terminal mounting pads at the ends the circuit board.  The notion being to provide a more mechanically robust conductor from the resistor to the terminals at the ends of the circuit board.

A great article in the October 2008 ABS Magazine, written by John Collins on page 10998 and 10999, discusses the history of the alternator out lights and their components and how they work in the system.

Some very interesting Beechcraft parts, available at RAPID,  outlined in this article that could be of interest to you and your mechanic in repairing or retrofitting your system with alternator out lights are:

P/N 36-380000-1 (14V Alternator Out Sensor) $196

P/N 36-380000-3 (28V Alternator Out Sensor) $122

P/N 36-380000-11 (Baron Replacement Alternator Out) $119

P/N 55-3025-1 S (Replacement PCB Kit) $108

Here is the pdf for the Lamar Alternator Out Relay

Here is more info on the Lamar sensor from a Beech Lister, Mike Ter.: