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Look at it like a standard 5 prong lighting relay, the 5th prong is meant to power a second light (or other input)
Ex, if you use a 5 prong relay for fog lights, your 4th prong is for one light, the 5th is for the other.
So if you don't have the 5th prong you won't power the second light.
Issue is, mine is the same way, yet works just fine.
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