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Old 03-21-2014, 07:26 PM   #1
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Headlight relay mod

I have been looking to do this mod can someone explain it alittle more to me how does it work with your headlight switch? And can you also send me a link to were you got your wiring harness? Thanks

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Old 03-22-2014, 12:19 AM   #2
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It is wired by running a wire straight from the battery, to a relay, and then to one light, using the old headlight power wire as a trigger for the relay. One relay/wire for each light. On the stock set up sometimes the voltage to the lights can be as low as 10.5 because of the voltage drop from all the wiring from the battery, to the distribution center, then to the switch, thennnnn to your lights, plus it keeps you from melting a switch.

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Old 03-22-2014, 06:17 AM   #3
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Old 03-22-2014, 07:04 AM   #4
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Not only does this increase the brightness of your stock lights by providing proper voltage. It also allows you to upgrade the bulbs also without the worry of burning your Jeep.
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Old 03-22-2014, 12:03 PM   #5
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Is there somewhere I could order a harness rather than making my own? To me it'd be easier to just plug and play
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Old 03-24-2014, 02:40 PM   #6
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Bump
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Old 03-24-2014, 02:44 PM   #7
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Yes you can buy a nice plug and play kit. I forget where I found mine but I think it was under $40
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Old 03-24-2014, 03:01 PM   #8
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Yes you can buy a nice plug and play kit. I forget where I found mine but I think it was under $40
I saved this link from another thread.
http://www.speedwaymotors.com/Headli...Kit,58825.html
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Old 03-24-2014, 10:28 PM   #9
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I saved this link from another thread. http://www.speedwaymotors.com/Headli...Kit,58825.html
How does this kit work with the headlight switch?
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Old 03-24-2014, 10:39 PM   #10
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I went with the putco harness which after installing I read horrible reviews. I took out the stock sealed lamps put in the hell e-code housing and h4 110/100 watt bulbs. Saw no problems for years. Put the putco harness in and I couldn't really tell the difference. That is just my experience though. The stock switch worked the same. Minus the fact that if you switch on your headlights on and off very quickly they won't come back on with the second turn on. You have to wait a slight second before turning them on again.
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Old 03-25-2014, 08:01 AM   #11
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Is there a plug on the harness that plugs right into the factory switch?
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Old 03-25-2014, 08:22 AM   #12
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Is there a plug on the harness that plugs right into the factory switch?
All the connections are under the hood IIRC
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Old 03-25-2014, 09:04 AM   #13
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Is there a plug on the harness that plugs right into the factory switch?
The headlamp switch is only used to power the relays, the lamps get power directly from the battery, via relay, instead of through the switch.
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Old 03-25-2014, 09:10 AM   #14
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Oh ok I think I get what you're saying. The switch is wired to the fuse box under the hood?
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Old 03-25-2014, 09:13 AM   #15
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I may just be overthinking it could someone explain like exactly what has to be done and what has to be taken out with pictures if you have them? Thank you go all the help so far!
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Old 03-25-2014, 09:26 AM   #16
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First one big benefit is much lower current thru the original switch which makes it last as much less contact wear in switch

Real simple a relay is an electromagnet controlled switch. So to one relay contact you supply fused 12 volt battery power and to the other contact you connect your headlight filament. If you run 4 relays each relay to one high or one low headlight bulb filament or if you run 2 relays one relay to both high beam filaments and other to both low beam filaments.

Then each relay gets one side of the the elector magnet coil connected to ground.
The relay or relays connected to high beam filaments get the other side of the magnet coil connected to the wire that used to light the high beam now pulled from the bulb. The relay or relays connected to the low beam bulb connection get the other side of the magnet coil connected to the wire that used to light the low beam also now pulled from the bulb(s).

Both headlights retain normal ground for low and high beam.

So now when stock switch supplies power that would have gone to high beam it closes the high beam relay and when stock switch supplies power that would have gone to low beam it closes the low beam relay(s).
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Old 03-25-2014, 10:15 AM   #17
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I may just be overthinking it could someone explain like exactly what has to be done and what has to be taken out with pictures if you have them? Thank you go all the help so far!
did you look at the link i posted earlier? plenty of pictures.
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Old 03-25-2014, 10:34 AM   #18
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did you look at the link i posted earlier? plenty of pictures.
I must have looked past it
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Old 03-25-2014, 01:03 PM   #19
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*Connect the RED wires of the harness to the B+, to power the switched side of the relays
*Connect the Black wire to the B-, to ground the coil in the relay
*Remove the connectors from the HEADLIGHTS and plug ONE of them into the harness, to supply the trigger signal to the relay to close the circuit (this comes from the headlight switch)
*Connect the two NEW connectors to the headlights, when the relay closes contact the lights will be supplied with current DIRECTLY from the battery.
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Old 03-25-2014, 01:10 PM   #20
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Here is a Diagram of the connection points
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Old 03-25-2014, 01:57 PM   #21
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Ok thank you all a ton I will be ordering the harness tonight I already have new lenses with h4 bulbs but I figured while I'm upgrading the lights I should upgrade the harness aswell
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Old 03-25-2014, 03:58 PM   #22
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good idea, lol...
make sure those things are aimed properly, gonna be BRIGHT
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Old 03-25-2014, 04:01 PM   #23
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Can someone please tell me what the distance is between the plugs of each headlight. Im working on making my harness for this mod, but i lost my piece of paper that had that distance. My jeep is at my buddies and i cant get in touch with him to take a measuremint for me. Thanks, Ian
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Old 03-25-2014, 04:05 PM   #24
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Can someone please tell me what the distance is between the plugs of each headlight. Im working on making my harness for this mod, but i lost my piece of paper that had that distance. My jeep is at my buddies and i cant get in touch with him to take a measuremint for me. Thanks, Ian
3.5-4 ' at the most, make it 5+ just to give yourself some wiggle room
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Old 03-25-2014, 04:38 PM   #25
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good idea, lol... make sure those things are aimed properly, gonna be BRIGHT
That's what I'm hoping for! But I will make sure they are aimed properly before going on the road with them don't want to blind anyone haha
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Old 03-28-2014, 12:31 PM   #26
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Quick question. can someone please tell me on the headlight which prong is for which light and what one is ground? thanks
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Old 03-28-2014, 01:38 PM   #27
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ground is the left pin, high the right and center is low.this is looking at the light, not the socket
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Old 03-28-2014, 01:57 PM   #28
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thanks !!!
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Old 03-28-2014, 02:14 PM   #29
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Apparently rectangular vs round matters with H4 and round one way and rectangular another

Center is always low and the side one with the black wire is ground leaving the remaining pin RD/OR color wire on 94YJ being the high beam
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Old 04-01-2014, 02:54 PM   #30
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Just got mine were does this connected go to?
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