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**dmjlambert** · 03-04-2018, 02:24 PM

Your headlights are powered by the generator or alternator, not so much the battery unless the engine is off. So somewhat close to the output of the generator or alternator where it ties into the rest of the truck wiring would be a good place.

03-04-2018, 02:24 PM	#3
dmjlambert Senior Member Join Date: Apr 2016 Location: Cypress, TX Posts: 3,563	Re: Relay location for headlights Your headlights are powered by the generator or alternator, not so much the battery unless the engine is off. So somewhat close to the output of the generator or alternator where it ties into the rest of the truck wiring would be a good place.