HID/Fog/9145/HID4U question
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What happens is that through the factory wiring, you can get a voltage drop which will then not be enough to fire the ballasts and start up the lights. If you use a relay, the power comes directly from the battery and there is a much less chance of voltage drops and misfires from the ballasts. Also repeated misfires can cause the ballasts to fail prematurely. The relays may not be necessary for the lights to operate and they may work fine without them, but a small investment for the relay will pay off in the long run in my humble opinion. Search on ebay for HID relay and you should find them.
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From: Northern California
For the OP...you won't need a relay harness for the fog lamp conversion. The plug from the original lamp will plug directly into the ballast and will draw less power through the wiring than the halogens do. The 9145 and the 9005 both have the same base (just don't ever use a 9005 halogen bulb in the round housings..it will melt over time..I know !! 
)
)Yes, it is plug and play.
Yes, the bulbs dont use as much power as halogens once they are fired up.
However, to fire them up, they need a large burst of power, one that the stock wiring often cannot provide, and like said before, you get a voltage drop. Eventually, this can lead to ballast failure.
Solution? A relay harness.
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From: Boston
Alright while I'm going to play it safe anyway and use another relay.
Heres a question: The relay go directly onto the battery... the positive one have a hookup for it (like a ground screw), but the negative I had to just stuff it in next to the post and tighten it down. Now if I go with fogs I'll have two jammed in there... is that acceptable or do they sell like mounting things that attach to the negative post... similar to what the positive post has on it already?
Heres a question: The relay go directly onto the battery... the positive one have a hookup for it (like a ground screw), but the negative I had to just stuff it in next to the post and tighten it down. Now if I go with fogs I'll have two jammed in there... is that acceptable or do they sell like mounting things that attach to the negative post... similar to what the positive post has on it already?
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You are partly right and partly wrong.
Yes, it is plug and play.
Yes, the bulbs dont use as much power as halogens once they are fired up.
However, to fire them up, they need a large burst of power, one that the stock wiring often cannot provide, and like said before, you get a voltage drop. Eventually, this can lead to ballast failure.
Solution? A relay harness.
Yes, it is plug and play.
Yes, the bulbs dont use as much power as halogens once they are fired up.
However, to fire them up, they need a large burst of power, one that the stock wiring often cannot provide, and like said before, you get a voltage drop. Eventually, this can lead to ballast failure.
Solution? A relay harness.
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From: Boston
The Bi-xenon kits come with 1 relay to run both headlights. The fog kits do not. Prices are in the $10-$20 range.
Technical Article Contributor
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From: Northern California
Alright while I'm going to play it safe anyway and use another relay.
Heres a question: The relay go directly onto the battery... the positive one have a hookup for it (like a ground screw), but the negative I had to just stuff it in next to the post and tighten it down. Now if I go with fogs I'll have two jammed in there... is that acceptable or do they sell like mounting things that attach to the negative post... similar to what the positive post has on it already?
Heres a question: The relay go directly onto the battery... the positive one have a hookup for it (like a ground screw), but the negative I had to just stuff it in next to the post and tighten it down. Now if I go with fogs I'll have two jammed in there... is that acceptable or do they sell like mounting things that attach to the negative post... similar to what the positive post has on it already?
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From: Boston
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From: Mesquite
x2^ Here is one that is still going. I just got two of them.
http://cgi.ebay.com/ebaymotors/HID-F...1047QQtcZphoto
http://cgi.ebay.com/ebaymotors/HID-F...1047QQtcZphoto