Thread: fog lamp relay
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Seeeu911 Seeeu911 is offline
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Join Date: Dec 2000
Location: Orlando fl usa
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I am installing a set of Hella fogs, which come with H3 55w and wanted to go to H3 100w.

So I have this same question. I emailed Marcus Sucro and this is his answer.

"The formula used to determine current is Watts/Volts = Current. As an example, 55W/12V= 4.58A. Remember that the fog lamp relay supplies both fog lamps so the current is doubled (2 x 4.58 = 9.16A) If you use a bigger bulb the current will go up proportionally. An additional consideration is the current carrying capacity of the wiring harness. This is not the easiest thing to calculate if you don't know the wire gauge. To make a long story short, I think you'll be fine with 100W foglamps and a 20A relay."
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Old 10-13-2005, 01:22 AM
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