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Old 12-08-2017
Martinw56  Martinw56 is offline
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Question 2008 WH Grand Cherokee Driving Lights

Hi all, I'm new to this site and I've been trying to find information on wiring Driving Lights to operate via Main Beam.
Could someone advise where and which wire on Main Beam to tap? The main Beam bulb has a constant pos (white) and a (black) wire.
Or maybe point me in the direction of a solution.
My car is a 2008 WK Grand Cherokee 5.7L limited. Over to you techies.

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If you have a constant positive and a switched earth wire, you run a new wire from battery positive, to a fuse, to your in cab switch, then to the coil of the driving light relay, then the other side of the relay coil to the black wire at the head light main beam. Then a heavier gauge wire from the battery positive to a fuse to driving lights, other side of driving lights to earth or battery negative.


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Old 12-08-2017
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Default Headlight Wiring

Would appear you need to tap into L33
White/Orange wire on the left hand headlight
to feed the relay trigger
Hope that helps

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Old 13-08-2017
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The WH is not negative switched (like Toyota's) its positive switched like proper car's are. It's 6am now and I will finish night shift at 8am. When I crawl out of bed around 3pm I will check where I tapped into the high circuit.
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Update, My car is Right Hand Drive.
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Default Thanks

Thanks for your replies.
SeaComms, your explanation suggests two connections on the relay only.

And running a wire directly from fuse to driving lights would mean they would permanently be on.

And Ren0vator, my lights do not have those wire colours. The high beam has a constant live White wire and a thinner Black wire.

Over to you Clarky.
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Default Now I'm Really confused.

I used a meter to check wires to the high Beam and the White wire shows constant positive, and the Black wire shows a constant Negative.
None seems to be switched.
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Default WH Driving Lights

Okay!

To wire in your driving light circuit its the same as any Aussie built Holden or Ford, switched positive.

I tapped into the WHITE wire on the drivers side headlamp as the trigger.

YES you will read a voltage of around 10/11V on the white wire when it is not on high beam, this is (albeit an educated assumption) a sense voltage that the computer uses to detect a blown globe or short.
If you connect up an LED driving light directly to this voltage it will glow but not light up, it's not able to supply enough current.

How I did it.
1- Tap into the WHITE wire on the drivers side headlight and run the wire into the cabin to the driving light isolation switch, some people fuse this but I didn't. I know, I'm a rebel

2- From the switch run a wire to pin 86 on the relay.

3- Ground pin 85 on the relay

4- From the battery run a wire to pin 30 on the relay (with an in line fuse ).

5- Connect the Driving light/lights to pin 87 in the relay

By the way I will change the title of this thread to WH instead of WK as there are subtle differences between the RHD and LHD versions that can lead you astray.
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