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HDi fun · 15-05-2008, 11:27 PM

One relay will do but using two means better current delivery to each lamp, and also you have some backup in the event of a failure ie. you won't lose both simultaneously should one filament fail and cause a transient voltage spike. These can happen even in DC systems, despite the fact that every twelve volt device is effectively parallel to the vehicle's battery give or take the internal resistance of the wiring loom.

15-05-2008, 11:27 PM	#19 (permalink)
HDi fun Moderator The Torque Meister Car: Peugeot 406 Join Date: Apr 2006 Location: SOUTH EAST Posts: 1,524	Re: Vehicle lighting One relay will do but using two means better current delivery to each lamp, and also you have some backup in the event of a failure ie. you won't lose both simultaneously should one filament fail and cause a transient voltage spike. These can happen even in DC systems, despite the fact that every twelve volt device is effectively parallel to the vehicle's battery give or take the internal resistance of the wiring loom.