Imo Two options ? Use seperate battery with LED lights ? Or wire in lights with its own wire ? Can be off inside light circuit as the load is very low with LED lights .
G'day Greg,
Firstly welcome to this forum - I hope your time here will be informative, helpful.
Your question - there could be various reasons from a blown fuse, a dry or loose joint, a screw that has entered & broken the feed wire.
You don't say anything about the history - has it worked before? Is the battery, power supply ok?
If you haven't got a multimeter, get one - you can get good, average meters for around $30 from places like Bunnings, Jaycar, other electrical/electronic shops.
ConsumerMan's suggestion is worth following it up.
There is an old saying "KISS" - it's amazing how many of us get caught by making faults dif ftficult!
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Warren
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If you don't get it done today, there's always tomorrow!