there is a fuse under the slideout, from what i've read.
usually blows when the switch is held on too long.
i've never had mine blow in the 7 1/2 years i've owned my 23SS(knock on wood), so i'm not sure where it's located.
are your lights working off the battery? if so, then the small resettable breaker wouldn't be the issue.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC