The l line also known as live or phase is connected to the first lamp and other lamps are connected through middle wire and the last one wire as n neutral connected to the supply voltage then.
Wire roof lights.
In above fig all the three light points are connected in series.
How to wire lights in series.
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Each lamp is connected to the next one i e.
Once it is in the snorkel head the cable will run down into the dirty side of the airbox and will require drilling through the side of the airbox to penetrate the wiring back into the engine bay.
Although it is indeed possible to wire the lights directly to the positive and negative battery terminals installing a complete electrical system into a diy camper is going to involve moving the branch circuits lights fans usb outlets etc away from the battery bank.
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To do this i recommend using a power distribution center like the wfco wf.
Although not commonly adopted it is possible to loop the wire from a roof light bar into the back of the snorkel head.
Find out how to wire roof mounted spotlights on your 4x4.