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    Thread: HID Installation with an Independant Relay

    1. Member EternalMind's Avatar
      Join Date
      Jun 7th, 2005
      337, B7 A4 (sold)
      09-14-2009 09:40 PM #51
      just for the record, what both dennisgli and nater are saying is correct (and a2b4guy also).
      (1) there is absolutely NO reason to put two fuses in series. this doesn't make any sense electrically at all...it actually adds more failure points to the system. and you want your fuse in-line as the first component from the battery to protect every other component downstream.
      (2) and it is 'best' to use two different power lines (including 2 fuses), one for each headlamp (if passing through 2 relays). why do you think the OEM system has 2 fuses like this?
      ...yes, you could carry an extra relay, but that will do you no good if the single fuse blows. in this case you need extra fuses too.
      you can certainly use one line for power and carry extra fuses and relays, but this doesn't do you much good if something decides to go bad while you're driving in the middle of the night with no ambient lights and have to be able to see to pull over, as you will lose both lights at the same time. this approach would fail any safety assessment.
      not that i think mine is any better than dennis's or nater's or a2b4's, but here is an additional writeup on all the reasoning behind the setups and diagrams for the setups discussed...and it's magically stickied in the FAQ at the top of this forum for easy reference (amazing how people fail to use the most readily available sources of information)
      Lighting FAQ/DIY
      HID specific with diagrams

    2. 02-14-2010 11:42 AM #52
      Resurrecting this thread: I have here what sees to be the same HID bulb controller (McCulloch) brand as the original poster. On its supply side (bottom connector) it has 3 pins. What each of those pins do?

    3. Member andrewduffield23's Avatar
      Join Date
      Jul 21st, 2009
      18343 PA
      95 golf 3 surf green,98 jetta TDI, 82 rabbit pickup, 88 dodge ram 50
      11-08-2010 09:19 PM #53
      Quote Originally Posted by redbora View Post
      anyone know what to use as the singal wire if your doing this for your fogs
      I also would like to know this
      "take the bypass valve off, put a half eaten jar of peanut butter in its place with 3 cotten Balls, and a package of red pez.... this may or may-not help."

    4. Member babyd209's Avatar
      Join Date
      Apr 20th, 2009
      11-11-2010 12:26 AM #54
      Quote Originally Posted by Misael View Post
      Aftermarket HID installation- How to rewire your headlight switch via an independent relay to send clean juice to the hid ballasts straight from the battery.

      I began selling some mcculloch hid kits and a few people including myself ran into a problem with the aftermarket kit. The lights would flicker on and off repeatedly as if it wasn’t receiving enough power to ignite the ballast. I couldn’t exactly pinpoint where the problem was. Whether it was the oem relay or the small gauge oem wires. I kept sending kits back to the manufacturer thinking it was a defective ballast until Doug (slammedvwgolf) suggested the fore mentioned problem. I researched it online and it proved true.
      Adding an independent relay can either fix a problem or avoid problems in the future. It’s very necessary if your hid kit is aftermarket, may not be necessary for oem kits. In my opinion I rather feed the ballasts their own juice straight from the battery since these cars weren’t designed for high intensity discharged lighting.
      Ok enough yapping.. here’s the how-to-
      Installing the Relay
      It's fairly simple.
      Things you need-
      The Relay- I purchased mine at Advanced Autoparts for $3.99

      Electrical Tape
      Wire Stripper
      Terminal Connectors
      Round Connectors
      14 Gauge Wire- Buy 2 colors. Red/Black or Blue/Black to differentiate polarities
      a Fused wire like the one below-

      First the Relay has numbered connectors on the bottom. Here’s the diagram.

      Crimp a Female terminal to each wire and hook them up to the relay. Use electrical tape around the terminal for better protection. Measure how much of each wire you’ll need for it’s destination.
      #30- Goes to the Positive (+) on the HID Ballast
      #85- Goes to any good Ground (-)connection. (I got mine direct from the battery)
      #86- Goes to the low-beamYellow/Black Line Wire from the Headlight Harness. It’s best to use the harness on the drivers side headlight.
      #87- Goes to the Positive (+) Direct to your battery.
      After the relay is all wired up, take each wire to their destination. Follow this diagram and pic-

      Next, Mount your ballasts in a safe dry place. Remember that the Blue colored wire (that goes to the positive (+) of your ballast) goes to both ballasts. Add a FUSE to the wire before it splits.

      And that’s it. Your HID’s will fire up using your headlight switch and gets it’s juice direct from the battery.

      I have 2 Relays installed in this pic because I’m running 2 pairs of ballasts. Headlights and Fog Lights. If you plan to add HIDs to your foglights also it might be good to add a second relay.
      This is my first writeup here so if I missed anything or didn't make something clear please let me know.

      Modified by Misael at 6:54 PM 5-27-2006
      thank you soooooooooo!!!! much for posting this i couldnt figure out why mine was making my dash shut down for a sec and flicker so much will do this p.s, i have fogs and headlights

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