Do I need a relay?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=20898
Printed Date: July 18, 2025 at 5:14 AM
Topic: Do I need a relay?
Posted By: Anthony1
Subject: Do I need a relay?
Date Posted: November 02, 2003 at 5:08 PM
Hi Guys, I was wondering if I need to use a relay on my driving lights. I see everyone recomends using one, but is it really a must??? My lights are 55 watts, 12V.
Replies:
Posted By: NowYaKnow
Date Posted: November 02, 2003 at 6:17 PM
Hmm using ohms law 55 watts divided by 12.6 volts gives you 4.4 amps times 2 bulbs = 8.8 amps (assuming only 2 bulbs come on when you turn your driving lights on..)..Now you didn't really say what exactly your hooking up is it a keyless entry or alarm or what? Either way it's always recommended to add a relay when your hooking up something other than the park lights (mainly headlights) but technically I think most modules will support it. Could always test the amp draw to be sure but you may want to just play it safe and throw in a relay..Good luck,
Mike
Posted By: auex
Date Posted: November 02, 2003 at 8:41 PM
You could use the parking light output if you are only hooking up the driving lights(make sure it is fused). If you are hooking up both parking lights and driving lights you should use a relay.
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