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Discussion Starter #1
2006 Nissan Maxima no taillights.
2 mechanics can’t find the broken wire.
I’d like to power them from a 30amp breaker with its own fuse /power feed and trigger the breaker with a marker light feed.
Sound doable?
 

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Are you talking about triggering a relay? A breaker and a fuse perform the same functions as they protect a circuit. If you mean a relay and protecting the circuit with it's own fuse then yes.
 

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Discussion Starter #3
Need the relay to power the lights.
I don’t know if it needs a fuse in the circuit.
 

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You should always put a fuse or circuit breaker somewhere in a power line. This prevents a shorted wire from melting the insulation and starting fires. You want a fuse rated for roughly 50% more than what you plan to draw. Putting a giant fuse on a small wire gets back to the fire hazard.

Fuses and breakers have two connections typically and just let current pass from one connection to the other unless they blow. Breakers will self reset after some time.

It sounds like you want to use a relay which normally has 4 or 5 wires. You would also need to add a fuse/breaker inline for safety purposes.
 
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