How to wire up your Headlight HALO LED - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus First Generation > MK1 Focus

MK1 Focus The place to chat about general questions, window tinting, exterior body, interior and lighting upgrades for the first generation 2000-2007 Focus.

Search This Forum | Image Search | Advanced Search    
FocusFest FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 05-17-2004, 06:30 PM   #1
FF #1 Most Wanted
microtonal's Avatar
Join Date: Sep 2003
Fan#: 470
Location: Seattle, WA
What I Drive: 2012 GTI, 2014 Forester XT

Posts: 6,890
FF Reputation: 12 microtonal Great Standing Member
Buy-Sell-Trade Rating: (7)
How to wire up your Headlight HALO LED

This subject keeps coming up more frequently since more people seem to be buying Halo projector headlights. So, hopefully, this post should help those who are about to make a purchase or just bought a pair.

In most cases, the Halo inside the headlight is just an LED(Light Emitting Diode) that requires about 2-3VDC.

In most cases, the Halo/LED does not have a resistor to limit the current and voltage to the LED. This is very bad. If no resistor is installed, you can bet they will burn out very quickly.

Look at it this way, lets say your car requires to be ran at 3000 rpms to be optimal. This can be achieved with a Cruise Control/Governer. If you drive the car at redline/7000rpms all the time, what do you think will happen ?
The engine would probably fail prematurely.

The same thing applies to the LED. The LED typically only requires about 2VDC and 20mA.
Without the resistor, it's like your giving the LED full throttle(12VDC) and it will eventually burn out. The resistor regulates the current and voltage to the LED at a safe operating level.

Check with your headlight manufacturer to see if they have a resistor in the Halo circuit.
Otherwise, install a 300 to 330 ohm resistor rated at 1/2 a watt for each Halo/LED on the headlight.

Typically, there are 2 Halo/LED per headlight. So, this would require 2 resistors per headlight or a total of 4.

Below is a diagram showing how the resistors should be connected to the Halo/LED.
The Halo/LED can be turned on by connecting them to your Grille Turn sigs, Bumper Turn sigs, Fog Lights or you could make a custom swtich and turn them on from inside the car independently.

Just reading.....
microtonal is offline  

Bookmarks & Social Networks

Quick Reply

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
More Led Swap and More Wire Management Under the Hood zx360 Ford Focus Builds & General Showroom 48 03-06-2012 12:43 PM
Voltage Stabilizer DIY dyn2liv DURATEC Performance (2003-2007) 26 01-15-2011 04:20 AM
Focus I: Headlight Blackouts IN, Gave up on LED turn signals... V8FordTempo MK1 Focus 2 12-11-2009 04:06 PM
ST170's headlight wireing? 5speedZX3 MK1 Focus 19 03-21-2005 09:33 AM
Headlight Jumper wire for Svt Hids matthews Archive 0 01-01-2004 09:46 PM

All times are GMT -5. The time now is 09:46 AM.

Copyright 2002-2014 All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat