Need help troubleshooting Gear Warning and cabin lights INOP

[N177MC]

This is for my New-to-me 1991 M20J MSE :

Gear waring horn as well gear light (in floor) and cabin lights non-functioning .

From the wiring schematic it appears that the cabin lights and gear warning sonalert share the same power supply,

but other than that I'm struggling to isolate the problem.

 

Any/all suggestions welcome  !

[PT20J]

Are the “cabin lights” you refer to the annunciator and floor gear lights, or the overhead lights that illuminate the cabin?

[N177MC]

20 minutes ago, PT20J said:

Are the “cabin lights” you refer to the annunciator and floor gear lights, or the overhead lights that illuminate the cabin?

Floor gear + overhead cabin lights

[PT20J]

1 hour ago, N177MC said:

Floor gear + overhead cabin lights

Cabin lights are powered by a fuse near the battery. 

Floor gear indicator light often burns out and goes unnoticed for some time.

These may be unrelated to gear horn. 

[201Mooniac]

58 minutes ago, PT20J said:

Floor gear indicator light often burns out and goes unnoticed for some time.

These may be unrelated to gear horn. 

I have found that the wire to the lamp socket in the floor gear indicator can work harden and break connection after a while.  The gear horn could also be misadjusted to the point it never somes on.

[N177MC]

Thanks guys for the tips.

I checked the 2 fuses near main battery, no joy.

Will check floor gear light with multimeter.

It appears that the cabin lights share the same connector as the sonalert in the roof - might be a clue ?

[Yetti]

I'd be looking for a ground that is not grounded.    Sometimes the Cannon Connectors need to be taken apart and put back together.    Next place to look is the switches in the belly next to the actuator