There are small cabin reading lights in a Bombadier Challenger, and there are two or three of them that are not working. I have two of them, and need to investigate to see if they can be repaired.

The part number CL16W25-3 seems to be searchable, but prices are not shown.

Checked the circuitry and noticed that each of the two has a small micro fuse:

https://www.arrow.com/en/products/0253004.m/littelfuse

They are blown, measured with a meter. Ordered 10 from Arrow Electronics, ETA 12/29/2016

Noticed that the fuse is on different sides of the circuit board on the two examples. Perhaps one of them has been replaced before.

It appears that the power that connects to the choke is Positive, but I'm not 100% certain.

12/22/2016.

There is a MOSFET (the largest active component) IRLZ44S, obtained manual.. From this, I'm assuming that pin S needs to be at ground.

Measuring continuity on the circuit board, it appears that the connection points should be like this:

When looking at the end of the connector, with the round sides up, the left connector is Positive, and the right connector is Negative. I applied 23 volts, and both lights worked after changing the fuses and repairing broken wires. The cooling fans aren't spinning - not sure if this is because they are not hot, or because part of the housing completes the ground part of the circuit.

12/25/2016 10:50 a.m.

When the two lights were installed, one had its fuse blown again. This is probably because of a white pinched wire that is on the circuit board. I replaced this with a longer red wire, and soldered on another fuse.

The remaining fuses are located in the small drawer labeled “fuses” above the work bench.

12/29/2016 3:01 p.m.