Cant help with a manual, but turn on the nav and anchor light breakers and toggles. Check for power at the breaker then at the toggles. Remove the light covers and check with a voltmeter for power. its not unusual to to find corroded lights or the crimped wire connectors on a vessel that old. If nothing then you will have to hand over hand the wiring back to the breaker panel. Hunt for the green monster.
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ