HIDS need wiring harness? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 31 (permalink) Old 10-15-2006, 10:50 AM Thread Starter
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So i recently bought a set of 4500k apexcones to install. I did a little looking around and it seems pretty straight forward. The one thing I am a little confused about is an after market wiring harness. Is this something I need, something I should do, or is it one of those do it if you want kind of deals. I can get all the stuff here and install it myself, I'm just really not sure if I need one.

Obviously I would like to make this project go nice and smooth, but I will take the extra time to make sure my car stays nice and I don't hurt anything. If anyone could shed a little light on this that would be great.


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post #2 of 31 (permalink) Old 10-15-2006, 11:12 AM
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It is highly recommended to use an aftermarket harness because the factory wiring harness wasn't designed to handle the large current draw when you first turn on the HID's. At start up, the current draw can be up to 15 amps for each ballast and if they are tied into the same power wire, it can add up to 25 to 30 amps total. For 15 amps, the ballast wires need to be 14 AWG and for 30 amps, the wire needs to be 12 AWG. Once the HID capsules reach operating load, the current draw will drop down to 4 to 5 amps, which is less than halogen.

If you use the factory harness, the headlight fuses will blow because they are only 10 amp fuses. If you replace them with larger fuses, then you have to worry about drawing more current than what the factory wires can handle. If it draws too much, over time the wire's resistance will increase, thereby increasing heat in the wires and eventually melting it.

Remember, it is not just the (+) wires that need to be larger, the (-) wires / ground must also be larger.

Also, use an appropriate relay to trigger the power to the HID's (typically 5-pin Bosch type).

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post #3 of 31 (permalink) Old 10-15-2006, 11:44 AM
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Quote:
It is highly recommended to use an aftermarket harness because the factory wiring harness wasn't designed to handle the large current draw when you first turn on the HID's. At start up, the current draw can be up to 15 amps for each ballast and if they are tied into the same power wire, it can add up to 25 to 30 amps total. For 15 amps, the ballast wires need to be 14 AWG and for 30 amps, the wire needs to be 12 AWG. Once the HID capsules reach operating load, the current draw will drop down to 4 to 5 amps, which is less than halogen.

If you use the factory harness, the headlight fuses will blow because they are only 10 amp fuses. If you replace them with larger fuses, then you have to worry about drawing more current than what the factory wires can handle. If it draws too much, over time the wire's resistance will increase, thereby increasing heat in the wires and eventually melting it.

Remember, it is not just the (+) wires that need to be larger, the (-) wires / ground must also be larger.

Also, use an appropriate relay to trigger the power to the HID's (typically 5-pin Bosch type).
[/b]

Good points, electrical engineer perhaps?

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post #4 of 31 (permalink) Old 10-15-2006, 11:49 AM
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thanks alot - i really needed this info as well.

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post #5 of 31 (permalink) Old 10-15-2006, 12:12 PM
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Quote:
It is highly recommended to use an aftermarket harness because the factory wiring harness wasn't designed to handle the large current draw when you first turn on the HID's. At start up, the current draw can be up to 15 amps for each ballast and if they are tied into the same power wire, it can add up to 25 to 30 amps total. For 15 amps, the ballast wires need to be 14 AWG and for 30 amps, the wire needs to be 12 AWG. Once the HID capsules reach operating load, the current draw will drop down to 4 to 5 amps, which is less than halogen.

If you use the factory harness, the headlight fuses will blow because they are only 10 amp fuses. If you replace them with larger fuses, then you have to worry about drawing more current than what the factory wires can handle. If it draws too much, over time the wire's resistance will increase, thereby increasing heat in the wires and eventually melting it.

Remember, it is not just the (+) wires that need to be larger, the (-) wires / ground must also be larger.

Also, use an appropriate relay to trigger the power to the HID's (typically 5-pin Bosch type).
[/b]
That's great technical info, but then there is real-world info.

There are many people that have been running HID's for over 2 years (myself included; in fact, I have 2 sets of HIDs) without any problems. I personally would not spend the money for a harness, the car handles a 35w HID kit just fine with no issues. A harness helps them start up faster (by about 1-2 seconds) but other than that provides no value at all.


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post #6 of 31 (permalink) Old 10-15-2006, 12:47 PM
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Do we have any actual reported cases of stock wiring failing because of HID's? I don't remember ever reading about one, but IMO I'd probably spring the $40 for peace of mind...


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post #7 of 31 (permalink) Old 10-15-2006, 03:22 PM
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Im using a aftermarket harness from RPM.... Just for the reason that you never know down the road!!! For the extra 40 dollars you get piece of mind, and the harness wiring is alot bigger and more heavy duty then the stock wiring! Here is some pics of the aftermarket wiring on my install!
http://forum.mazda6club.com/index.php?showtopic=59928

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post #8 of 31 (permalink) Old 10-15-2006, 11:49 PM
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i have the 8000K McCulloch HID's on my 6 with a stock harness and ive never had a problem. i had HID's on my last car as well with a stock harness and never once had a proble. i personally wouldnt spend the money on the harness.


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post #9 of 31 (permalink) Old 10-16-2006, 12:04 AM
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hmmmm.. nobody really knows how our car will withstand the high amperage startup from the ballast, it might be the fact that Euro-spec 6 has stock xenon and thus PNP retrofit, and MAYBE they didnt change the wiring as well...

for that 40 bucks, i wouldnt risk melting the stock harness, and IIRC, it costs at least 10 times than buying a harness, if you want to risk it, go ahead, but i m not a risk taker myself, especially when it comes to my 6. just my 0.02

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post #10 of 31 (permalink) Old 10-16-2006, 12:53 AM Thread Starter
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Well I have all the parts together to assemble the harness, so I guess I will do it. Like I said before I will spend the money if it will protect the car.
Now comes the fun part of putting the harness together and installing everything. I plan to start this project tuesday after work. I will do my best to take some pics of what I got and how I connected everything together. I have to warn you though, I take terrible pictures.

If anyone has a picture of a harness they built that would be sweet, otherwise I will just figure it out as I go along.


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