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Brighter "ROUND" Headlights CJ/YJ

#1 User is offline   Rollbar 

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Posted 06 September 2007 - 11:23 AM

So you want to wire up a relay for your headlights in your CJ. Perhaps you don't know why you'd want one so you're reading this to find out why.

A relay switch for your headlights acts in a fashion similar to the solenoid on your starter. The solenoid is a switch that is activated by a small electrical current that switches on a bigger electrical current. Rather than drawing all the current that the starter requires through the ignition switch you only draw enough to flip the switch in the solenoid which in turn draws power straight from the battery.

Installing a relay for your headlights does the same thing. It doesn't draw all the power for the headlights through your switch. Instead it only uses the switch to trip the relay and draws power for your headlights directly from the battery. The result is brighter headlights since you're bypassing your headlight switch and smaller gauge wire and drawing more amps right from the battery instead. If you have higher than stock wattage bulbs or aftermarket lamps a relay is a good idea for those cases too to preserve your switch that's 30+ years old or not designed to carry the load you may be asking it to carry.

For the purposes of this installation a Dick Cepek dual relay was installed from Extreme Suspension, http://www.extremesuspensions.com/lighting...hting_index.htm

First you need to determine which wires come from your high/low beam switch and which one is the high and which is the low beam using your multimeter.
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Then disconnect the battery at the negative terminal.

Wire the high beam side to S1 using a spade connector.

Wire the low beam side to S2 using a spade connector.

Using a loop attach both high beam wires to L1

Using a loop attach both low beam wires to L2

Attach a wire to S3 to the negative side of your battery using at least 12 gauge wire.

Alternatively, ground the relay to a suitable location on the frame or engine.

Attach a wire to B to the positive side of your battery using at least 12 gauge wire.

Alternatively, wire the the power to the charging stud of the alternator.
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Reconnect your negative terminal.

Enjoy your new brighter headlights!

Wiring Diagram
Below you'll find a wiring diagram of how this is done.
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Here is another diagram, notice the low beam tied into the hight beam.
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Elsewhere on the web see
The Bosch Relay Unravelled
Daniel Stern Lighting, Why Use a Relay, a much more detailed article than this.
By Adam Sparks
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#2 User is offline   LostJ 

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Posted 08 September 2007 - 01:18 PM

:banghead:
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#3 User is offline   73_cj_project 

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Posted 23 October 2007 - 09:47 PM

Bump for a good article and others thinking of doing this.

Gus
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#4 User is offline   SouthernStyleV8 

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Posted 24 October 2007 - 10:28 AM

how much of a difference is noticable with the lights wired this way.. when my jeep idles... at abotu 600 rpm my lights will dim until the rpms re4ach 800-1000... then they get bright again.. i dont like seeing them dflicker this is why i am asking
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#5 User is offline   Allcruisen 

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Posted 19 November 2007 - 10:17 AM

Thats an excellent write up and the importance of using a relay... :scratch:

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#6 User is offline   JeepinIan 

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Posted 19 November 2007 - 11:30 AM

View Postsouthernstylev8, on Oct 24 2007, 10:28 AM, said:

how much of a difference is noticable with the lights wired this way.. when my jeep idles... at abotu 600 rpm my lights will dim until the rpms re4ach 800-1000... then they get bright again.. i dont like seeing them dflicker this is why i am asking



The amperage from your alternator is too low. You are drawing more amps w/ the lights than the alt. is putting out at an idle.
Ian Stewart

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"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling that thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." ....

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#7 User is offline   MrSig 

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Posted 02 December 2007 - 04:27 PM

That is cool! I never new you can do that.. Thanks..
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#8 User is offline   Rollbar 

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Posted 06 February 2009 - 07:34 PM

Here is another diagram added to the original post. NOTICE, the second part of the pic on the dimmer foot switch (CJ-yJ). U can jumper it and have both on giving U a brighter light. :)

Again, notice the low beam tied into the hight beam.
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#9 User is offline   Wildbill 

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Posted 07 February 2009 - 08:50 AM

So this newer way will give you brighter lights on both, low and high beam???

Great write up, Don't believe I saw it before...... thanks for the update :)
Yale H.
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#10 User is offline   Rollbar 

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Posted 07 February 2009 - 05:03 PM

Really adds a BUNCH of light to the 'High Beams' when they are on & wired this way w/the jumper.
*MY CJ IS YOUR yJ's DADDY*

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#11 User is offline   soflmuddin 

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Posted 07 February 2009 - 05:15 PM

i wired my cj to a double pull switch. pull part of the way out you have output on terminal 1 pull all the way out and you have output on 1 &2. so i have low beams on 1 and high and my kc's on 2. 1= driving and polite night riding, 2 = obnoxious and work light.

i got these switches from service auto years ago. using this switch eliminates the need for relays but requires rewiring you system. ok for me cause i got the cj in pieces with the electrical all cut up in a grocery bag.

this is a save for your lights, i have run this way for comming on 7 years with the same lights. :2thumup: rollbar.
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#12 User is offline   Rollbar 

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Posted 07 February 2009 - 05:18 PM

Nice thought, how bout a write up and drawing :2thumup:
*MY CJ IS YOUR yJ's DADDY*

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#13 User is offline   JeepinIan 

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Posted 07 February 2009 - 05:51 PM

Personally, I would want my off road lights separate from any other lights.
Ian Stewart

If you don't fight for the trails, there won't be any trails to fight for.

What you get by achieving your goals is not as important as what you become by achieving your goals.
Zig Ziglar

"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling that thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." ....

John Stuart Mill

#14 User is offline   soflmuddin 

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Posted 07 February 2009 - 07:41 PM

x2, but it is an offroad jeep only. i only run low or full on.


dont have a good drawing program, had to use word art............
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.................97 s-10....................................79 cj-5........................................03 wj......................................67 cj5...................................87 samurai..........



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