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Old 06-22-2012, 11:14 AM
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Thumbs up 2007 Grand Cherokee WK LED Bulbs Front and Tails

Hi,

I just went over a tone of threads and my understanding thus far is that my particular Jeep (07-on) have the 3157-CK bulb sockets in the rear.
No mention on what wiring they have in the front blinkers/parking bulbs though.

I just want to let everyone know on what I did and how it seemed to work only about half way though

Not knowing the rear needed 3157-CK's I got the regulars. After I went through the fuses like everyone else, read stuff on here and there and rewired the bulbs. The cheap stuff I got off of ebay was easy enough to rewire the leads and now it seems to be correct.
Weird stuff goes on...(Let me mention I have no resistors in yet) Rear driver side works perfectly, passenger side, not so much. Having this single bulb setup on my 07, it needs to do 3 functions as we all know (brake, blink, park).
The passenger side like I said works ok as long as the park light is OFF. If I turn it on, it flickers. Now, if I pop the LED's out and put my incandescents back in, it's all perfect.

I went ahead and ordered the 50W / 6Ohm resistors and I'd be splicing them in parallel with the blinker wire and ground wire for the rears.

Curious enough, there are different blinker relays for each lamp. Meaning you have 4 separate fuses / relays for each front, rear, left, right.

Based on what I read, the front does need resistors if you switch to LED's on the blinker/park lights. Most people suggest the 3 Ohm version. Can anyone confirm or deny that for the front?
Also, does anyone know for sure if the front uses the 3157-CK or the regular 3157 as far as the wiring goes? I am particularly interested in 2007 WK.

Any responses are more than welcome.

Thanks !
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Old 06-25-2012, 11:40 AM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

Really? Nobody knows if the front blinkers are 3157 or 3157-CK on a 2007 WK?

I'd apreciate any response.

If I get no answers, I would have to put a voltmeter on the bulb socket and figure out what prong is what and go from there... It sucks because I have the ballasts in the way and the front lamp is a bit tough to get to.

I'll be back to post my findings soon, unless one of you can beat me to it.

Later!
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Old 06-26-2012, 10:29 PM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

Try this from wkjeeps.com http://wkjeeps.com/lamps/wk_lamps.htm I have 3157A in the front (amber) and 3157 in the rear (clear).
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Old 06-28-2012, 07:26 AM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

Yeah, I've seen that page, has great info just does not mention anything on the front wiring as to (3157 or 3157CK). The issue at hand is with regular incandescent bulbs, it works either way, but with LED's you have polarity. Use the wrong type wiring and you'd be blowing fuses left and right.
3157A is the same as the 3157 except it is A (for Amber) and that is the type of incandescent bulb you have.
Thanks for the reply. Nobody else seems to know anything about this. I'm surprised.
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Old 06-28-2012, 07:33 AM
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Front is standard 3157.
Front is 3 ohm BUT sometimes its 1.5.
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Old 06-30-2012, 01:36 PM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

Quote:
Originally Posted by etonic View Post
Yeah, I've seen that page, has great info just does not mention anything on the front wiring as to (3157 or 3157CK). The issue at hand is with regular incandescent bulbs, it works either way, but with LED's you have polarity. Use the wrong type wiring and you'd be blowing fuses left and right.
3157A is the same as the 3157 except it is A (for Amber) and that is the type of incandescent bulb you have.
Thanks for the reply. Nobody else seems to know anything about this. I'm surprised.
LED's are directional, but they're just diodes. They won't run if you reverse it unless the voltage is high enough to break down the diode. It shouldn't blow any fuses if it's backwards - you just won't have any light.
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Old 07-05-2012, 12:57 PM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

Verminator, I agree with you totally, however the bulbs have different wiring. What I mean by that is the regular 3157 and the 3157-CK have completely different wiring. I can tell you that I blew several fuses until I found out the problem (when I did my rear mod).
Having said that, I wanna thank you all for your input. Thanks robpp for clarifying the front being 3157.

On another note, I ran into an unexpected issue with my tails. For some reason I did not think it was important to replace the factory 3157 incandescents with "red led" bulbs as some of you may have suggested. I figured, if the stock bulb is "white" why would I want to replace it with a "red" LED? It didn't make much sense to me then, but after reading some posts, and other expert's opinions on this matter I gather the following:

The "white LED" bulbs give out light in a different light spectrum than incandescent bulbs. Therefore the red lens that is your tail light filters out most or a lot more than regular light coming from a regular incandescent bulb - thus you get less light output from white LED's through a red tail light.
If you however replace the white LED's with red ones, the problem is solved (in most cases) because it turns out, the red light from the red LED's does not get filtered off by the red lamp, therefore it gives out more visible light.
Having said that, I ordered a couple of different types of red LED's and I'll try to work it out, see what works better.

I do want to mention that the cheap LED's I got were regular 3157's, not the CK type. I had to modify them in 2 different stages.
1. Transform the 3157 into a 3157-CK
2. Add 2 diodes inside each bulb to prevent the damn resistor from burning up. Yeah, I am mean the little resistor inside the LED bulb, not the 6Ohm / 50W guy I spliced into the wires to fix the blinking issue.

So far so good, I am just waiting to get my red LED's and then back to modding as stated above. If anyone needs info on how to do it or why, let me know. I can explain.
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Old 07-05-2012, 01:04 PM
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Re: 2007 Grand Cherokee WK LED Bulbs Front and Tails

First of all, thanks for responding!
I believe it has to do with what bulbs get replaced with LEDs. I mean the headlight enclosure houses 2 turn signal bulbs (2 for left and 2 for right). So if some of us replace just the front facing bulb and not the side jobber, then you need the 3 Ohm. If you replace both, then 1.5 Ohm perhaps... And that's per side.
That's my take on it anyway... Correct me if I'm wrong.
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