Need some advice how to connect a light bar to come on with hi-bean please - Page 2 - Jeep Garage - Jeep Forum

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  #13  
Old 09-03-2015, 10:42 PM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

It's easy to do. You need a 40 amp 4 prong relay. Commonly called an off road light relay. I found a picture online to help show how to wire the relay but am not sure how to post it. There are 4 prongs on the relay, 1 prong supplies the 12v pos+, other prong is 12v neg-, other prong is your 12+ "switch". Last you have your 12v pos+ out. The "switch" is any 12v pos+ power you tie into, like your high beams. When you activate/turn on your high beams, you will send power to the relay which "throws a switch" inside the relay to connect the already waiting 12v pos+ power. Like when you flip a swich to turn on a light in your house. When the relay gets it's power, bam, you have power to your light bar. You will just have to find a good ground. I found a grounding block in the engine bay on the inner fender on my Wj to connect my neg/grounds. I hope this helps and doesn't confuse you.

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  #14  
Old 09-04-2015, 12:18 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

Thanks guys this is all good info, so very helpful.
Pretty sure the light bar wiring has a 40A relay so guess I'm all set as long as the wiring is long enough.

Just have to wait for the mrs to bring my car back so I can pull the wiring and check it out. Before this I had the bar on the roof running straight off the battery before the rules changed. Admittedly it was more illegal then, than it will be down low where I moved it to.


Cheers, Simon
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Old 09-06-2015, 05:42 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

Decided to go with the 'add a circuit' option for powering the relay, however I was unable to see any fuse dedicated to the high beam. There is one fuse 'Electro-chromatic Mirror/Smart High Beams - if equipped' but I would imagine this is for the gear that decides if HB's should come on, and as such the circuit would always be live.

Another fuse is for 'Body control - exterior lighting #2' which tells me there may be a controller for the lights on the end of this circuit, rather than a direct connection to any lights.

So I suppose it might have to be option 2, tap the high beam wire that some here have already pointed out.

Looking forward to getting this hooked up for the 10-hour drive to Shark Bay later this month
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  #16  
Old 09-06-2015, 08:53 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

The Aussie HID lights have one fuse/relay for each headlight (see diagram). The high beam signal operates solenoid/blind to shadow the upper light output. My install used a relay that had a separate power circuit. An inline fuse was connected between the relay and the + post inside the fuse box.
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  #17  
Old 09-06-2015, 07:44 PM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

mate i grabbed my trigger from the loom behind the rh headlight, best advise use a relay. there are plug and play looms available with a switch for inside the car.
not sure of the quality but this is exactly what you are after. 12v is located in the previous post in the fuse box.

NEW 2 5M Harness LED Driving Light Wiring Loom Work BAR 14V 40A Switch Relay KIT | eBay
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Old 09-07-2015, 04:23 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

Thanks Nicjak that loom is pretty much what I have here. I'm going to have to add a length of wire to it though, to get power from the high beam trigger to the switch inside the cabin.


Cheers, Simon
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Old 09-07-2015, 05:31 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

Instead of routing wires inside the cabin, you should do what I did and install a key fob remote to turn the light bar on. All my wires are under my hood. The remote works up to 50ft away from my Jeep.
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Old 09-07-2015, 07:01 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

Mate that might be acceptable in your country but not here. They have to switch off with your high low dip switch
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Old 09-07-2015, 07:03 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

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Originally Posted by sironic View Post
Thanks Nicjak that loom is pretty much what I have here. I'm going to have to add a length of wire to it though, to get power from the high beam trigger to the switch inside the cabin.


Cheers, Simon
You can just mount a relay so they turn on and off with dipper. No need for inside switch. But might be an issue for a rwc.
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Old 09-07-2015, 07:07 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

RWC? This is the Wild West man... not required even when transferring. This might provide some idea of the percentage of POS littering the roadways here. It blew my mind when I moved here...
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Old 09-07-2015, 07:07 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

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Originally Posted by nicjak View Post
Mate that might be acceptable in your country but not here. They have to switch off with your high low dip switch
That's how it is where I'm from too. If you get your 12v power from your high beem and wire that to your relay, you can still add the remote and be legal. When you switch your low beems on the power will be lost to your light bar and turn it off for you.
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Old 09-07-2015, 07:10 AM
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Re: Need some advice how to connect a light bar to come on with hi-bean please

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Originally Posted by lowrider__rt View Post
That's how it is where I'm from too. If you get your 12v power from your high beem and wire that to your relay, you can still add the remote and be legal. When you switch your low beems on the power will be lost to your light bar and turn it off for you.
I understood what you were proposing. The cool thing is that you could use a multi button remote and have a sneaky "force on" mode for setting up camp and stuff like that.
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