That "relay" is probably a 30 amp autoreset circuit breaker. My guess is that you've either got corrosion on the battery terminals, a loose connection or the battery is weak and won't hold a charge. Disconnect the battery, Check the water level, hook the battery up to a separate battery charger then after a few hours of charging, reconnect it and see if you have lights. Another option, if you have a spare battery (from a boat, or ???) replace the current battery and see what happens.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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