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Old 09-24-2012, 01:52 PM   #1
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Exclamation WTFog light issues

Ok so this is probably a silly question to the electrics gurus in here, but since I am le suck with wiring and electrics I'm hoping its not too dumb.

I want to run HIDs in my fog lights.

I ordered 2 sets of HID's on accident, 1 set I installed into my headlights and its working fine, the other set I bought an extra set of 3000k bulbs (yellow) for and want to run in the fog lights.

Its a "slim" 35W Xentec kit that I've had good luck with many times before.
Now the problem: when I splice the kit into the wires going to the fog light bulb, and turn on the fogs, nothing happens. I've tested the ballasts and bulbs, and they work. I've put regular bulbs into the fogs and they work too.

So now the question: does the miata fog light system put out more or less power than the HID kit can support? Do I need some sort of fancy wiring harness/relay? What am I doing wrong?

PS: I guess it should be mentioned that the original fog bulbs are H1, and what I'm trying to run now is 9006, but the ballasts and everything else is the regular 35W just like on the headlights.

Any ideas?
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Old 09-24-2012, 04:55 PM   #2
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So you're NOT running an aux power source/relay setup for the HID foglights and are just using the 12v power from the stock harness to power the ballast?

I would definitely tap power from the main box and run a power/relay setup. If you want to be boss, you'll use the parking lights for 12v signal. This way you can operate the fogs independantly of the headlights (run the fogs as DRLs when the parking lights are on) and they will also stay on when you hit the highbeams.
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Old 09-29-2012, 03:52 PM   #3
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Correct-o-mundo.

I'm guessing the power supply to the fogs is much weaker than the headlights for some reason?

I'm just trying to get these suckers to work when I press my fog light button, don't really care that much about independent operation. This is not to show off at some hard parker convention, but more so my commute to work at 4am every morning leaving a little more lighting to be desired.

So does anyone have any ideas where I could pick up said relay/wiring ? Or is that something best done DIY?
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Old 09-29-2012, 03:55 PM   #4
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Hmm, looks like there are a bunch on egay for relatively cheap:

miata hid relay kit | eBay
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Old 09-29-2012, 04:02 PM   #5
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You can get a generic relay kits at VatoZone or AdvanceVato.
Using the parking lights isn't for hardparking...it's just swesome to have HID fogs, HID lows and highs on at once when you really need to see something.
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Old 09-29-2012, 04:04 PM   #6
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Ahh, didn't even think of vatozone. I'll check it out.

And perhaps I'll take your advice on the parking light idea: mine are not being used anyway (I put in a spare set of bulb-less rear ones so they're nice and red and not the ghey yellow) so the wiring for them is right there waiting to be used.
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Old 09-29-2012, 04:34 PM   #7
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You'll like the set up....

On the topic of fog lights...I did just score a set of replacement fogs in yellow glass for $65/shipped. The NB OE fogs are the same used on some year Ford Escape, Ford Focus and Loncoln LS...and I think even some Mustangs. No more rock-shipped clear fogs for me! On eGay, they come in clear, smoke and yellow glass.....food for thought. I plan on getting a HID kit for them and adding 2k or 3k bulbs....I want dem biccches cray yella.

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Old 09-29-2012, 04:37 PM   #8
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Oh snap, that DEF looks like it will fit. Link?
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Old 09-29-2012, 04:42 PM   #9
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Old 10-12-2012, 10:16 AM   #10
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Dammit. Got those foglights last week and they're about 1" too big everywhere...mounting, the size of the lens. Dammit. Back on the hunt for replacements that fit the Miata.
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Old 10-12-2012, 10:19 AM   #11
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damn
glad I didn't order a set
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Old 10-12-2012, 12:21 PM   #12
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Yeah, at least we know now lol. Luckily, the return process was very easy and they're on their way home. However, doing more cross-referencing on part numbers this morning, the Ford Freestar, Grand Marquis (incl. Merauder), GT and 06-07 Focus use the correct foglights. Unfortunately, no one makes aftermarket tinted or yellow versions. On the plus side, the other part numbers for some of the Ford vehicles can be found on ebay for $80-90/pair shipped...and these are advertised as glass lens replacements.
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Old 10-12-2012, 02:32 PM   #13
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Did you buy a relay kit yet? Dont buy the advanced auto one, tiny wires and basically just has female spade terminal connectors for the relay that fit loosely. You either want the one with a legit single piece socket for the relay, or just do it with your won female spade terminals and heat shrink. I prefer the actual relay socket.
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Old 10-12-2012, 02:43 PM   #14
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was going to order that egay one I posted earlier. none of the local places carry that stuff oddly enough
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Old 10-12-2012, 02:49 PM   #15
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Dont get that one. It has the single connector like the advanced one, and I'd guess it would be just as loose and chinsy. It could very well be fine, but for like 8 dollars more they have the good style one on amazon. Then getting or even using a fuse will depend on you and where you decide to pull the power from.
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Old 10-12-2012, 02:58 PM   #16
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That was my next question: what is a good source for power?
Should I use the wiring going to the parking lights like Dopple suggested?
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Old 10-12-2012, 03:08 PM   #17
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I believe he means to pull the +12v signal from the parking lights rather than the headlights like stock. Then the ground trigger goes to the fog switch. You also pull +12v power off the main post on the fuse box under the hood, but you'd need an in line fuse. I think thats what dopple is saying. If not, you could take the the current 2 wires going to the fog lights as the signal lines and just pull power off the main post with a fuse, then ground the lights to the chassis.
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Old 10-15-2012, 12:14 PM   #18
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that's what I'm trying to clarify - does this make sense to everyone:

signal/trigger connected to original fog light wiring.
power source coming from parking lights.
or should I have power source coming from fuse box? Or battery? Or ???
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Old 10-15-2012, 01:53 PM   #19
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You will want to pull power from the fuse box, with nice heavy gauge wire all the way to the relay. Pulling power from there would require an inline fuse.
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Old 10-15-2012, 02:24 PM   #20
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The harness already has that so that's cool. And just because I'm le dumb with wiring - where exactly from the underhood fusebox do I draw said power?
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