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Old 03-09-2011, 12:08 PM   #1
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H4 wiring harness upgrade

Hey guys,

I'm looking for a nice inexpensive plug and play wiring harness upgrade for my headlights. Here's the bulbs that I'm going to buy LUMINICS KRYPTON PURE BLUE H4 HEADLIGHT BULBS BULB - eBay (item 270716047558 end time Mar-15-11 22:14:12 PDT)

Do you guys think that a harness upgrade is necessary to run these?

Thanks guys!

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Old 03-09-2011, 12:37 PM   #2
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You shouldn't need to since they are stock wattage. You already have H4 housings right?

-Wes

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Old 03-09-2011, 01:18 PM   #3
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Here's the harness I used. I thought it was made really well, and it was only $28
Amazon.com: Putco 230004HW Premium Automotive Lighting Wiring H4 100W Heavy Duty Harness and Relay: Automotive

But why do you want those bulbs? They will put out much less light than bulbs without a filter. A highly recommended bulb is the Philips Xtreme Power.
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Old 03-09-2011, 01:21 PM   #4
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Quote:
Originally Posted by 98tj25l
Here's the harness I used. I thought it was made really well, and it was only $28
Amazon.com: Putco 230004HW Premium Automotive Lighting Wiring H4 100W Heavy Duty Harness and Relay: Automotive

But why do you want those bulbs? They will put out much less light than bulbs without a filter. A highly recommended bulb is the Philips Xtreme Power.
You have a link to those bulbs?
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Old 03-09-2011, 01:23 PM   #5
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Originally Posted by 98tj25l View Post
Here's the harness I used. I thought it was made really well, and it was only $28
Amazon.com: Putco 230004HW Premium Automotive Lighting Wiring H4 100W Heavy Duty Harness and Relay: Automotive

But why do you want those bulbs? They will put out much less light than bulbs without a filter. A highly recommended bulb is the Philips Xtreme Power.
Is there any write-up for how to install this? Wouldn't have any idea what to look for under the hood.
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Old 03-09-2011, 01:24 PM   #6
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Originally Posted by KP Texan View Post
You shouldn't need to since they are stock wattage. You already have H4 housings right?

-Wes
Yes, however the stock wiring restricts voltage to the bulbs. By adding a harness you allow the full voltage to reach the bulbs, which makes them perform better.
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Old 03-09-2011, 01:29 PM   #7
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You have a link to those bulbs?
Amazon.com: Philips 9003 X-treme Power Headlight Bulb, Pack of 2: Automotive
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Old 03-09-2011, 01:33 PM   #8
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Quote:
Originally Posted by 98tj25l View Post
Here's the harness I used. I thought it was made really well, and it was only $28
Amazon.com: Putco 230004HW Premium Automotive Lighting Wiring H4 100W Heavy Duty Harness and Relay: Automotive

But why do you want those bulbs? They will put out much less light than bulbs without a filter. A highly recommended bulb is the Philips Xtreme Power.
And $10 shipping ... I could make my own harness for less than that...
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Old 03-09-2011, 01:34 PM   #9
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Sweet !!! Thank you. Oh and do you have these bulbs? How do they look and compare to let's say the Hella lights or silverstar ultra?
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Old 03-09-2011, 01:34 PM   #10
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Is there any write-up for how to install this? Wouldn't have any idea what to look for under the hood.
It's really easy, just simply plug and play. You simply attach the harness to the battery terminals. Then you disconnect the passenger headlight plug and plug that into the harness. Then plug the harness into the headlights. The hardest part is routing the wire to the driver side. I ran mine behind the front grill. If you look there is already a cable there, I just zip tied directly to that. I'll try to take pictures tonight or tomorrow. It took me less than an hour to get it all tied in.
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Old 03-09-2011, 01:53 PM   #11
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Yes, however the stock wiring restricts voltage to the bulbs. By adding a harness you allow the full voltage to reach the bulbs, which makes them perform better.
You don't have to convince me of that fact...my crappy stock wiring/switch resulted in a measured voltage drop of about 7%. After my relay conversion, it was down to less than 1.2%. I didn't want to throw my two cents in about bulbs but, since everyone else is, my recommendation is that you go with standard Hella 100/55w bulbs or 100/80w bulbs (no tint!!!!).

-Wes
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Old 03-09-2011, 02:07 PM   #12
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Sweet !!! Thank you. Oh and do you have these bulbs? How do they look and compare to let's say the Hella lights or silverstar ultra?
I do have these bulbs, and I've been very happy with them. However I can't directly compare them to bulbs you listed. I will say that when I compare my lights to others I notice that these are much whiter.
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Old 03-09-2011, 07:48 PM   #13
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You shouldn't need to since they are stock wattage. You already have H4 housings right?

-Wes
Yeah I bought some housings with blue halos in them last year so I wanna match them up again. Pretty much all the other bulbs are blue right now so it looks kinda cool on a patriot blue TJ.

So from what you guys have been saying if I add a harness it will increase the performance right? If I don't install a harness do you think that I might run the risk of burning down my stock wiring harness or is it not really a big deal? I don't know what the stock sealed beams were for burning temp and wattage so some info would be greatly appreciated. Oh yeah by the way, they ran out of the ones I ordered so the gave me a free $10 upgrade to the better Krypton bulbs LUMINICS KRYPTON PURE BLUE H4 HEADLIGHT BULBS BULB - eBay (item 270716047558 end time Mar-15-11 22:14:12 PDT)
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Old 03-09-2011, 10:37 PM   #14
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Originally Posted by 98tj25l View Post
It's really easy, just simply plug and play. You simply attach the harness to the battery terminals. Then you disconnect the passenger headlight plug and plug that into the harness. Then plug the harness into the headlights. The hardest part is routing the wire to the driver side. I ran mine behind the front grill. If you look there is already a cable there, I just zip tied directly to that. I'll try to take pictures tonight or tomorrow. It took me less than an hour to get it all tied in.
Heh... that is easy. Also sounds like a good excuse to get a fuse block under the hood.
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Old 03-09-2011, 10:45 PM   #15
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Heh... that is easy. Also sounds like a good excuse to get a fuse block under the hood.
Or a sealed ATC fuse holder... Parts express is your friend! Shipping costs some money so I always order more than I need for the future.

-Wes

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