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Hi my name is Robert.....
Where is this light located and is it the only one that is not working? IS there other lights that are working that share the same switch?
So is the furnace, water pump and all the other DC items working?
Do you have a house disconnect switch inside near the entry step?
I would first go to the house battery and follow the cables, make sure you do not have a breaker that is tripped, many times that breaker will be 18" from the battery and can be on the frame or in a battery control box which would be outside. Most breakers will have a tiny tab on them that will pop out when they trip. IF you see any breakers the voltage on each post should be the same to chassis ground.
I would then go to the fuse panel inside and probe each fuse for power. Make sure the main wire to the fuse panel is clean and tight.
With all the DC items not working but the one light sounds like you have a breaker or blown fuse, the lights and furnace should be on separate circuits or each have it's own fuse so have to see if DC voltage is getting to the fuse panel. Robert
You would have to follow the cable from the battery and see if they are using one between the battery and fuse panel, sometimes they are on the chassis frame or they are inside a battery box with other fuses and breakers, it would be outside, it normally will supply the interior panel. Robert
Sounds good let me know if you need more help. Please keep in mind I only get credit when you select a rating... Robert
10-4 I am around daily and respond when I can... Robert