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Old 09-14-2009, 12:42 AM   #1 (permalink)
Green Machine
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All-on Headlight Guide!

All on Headlight Mod Guide
This is just a guideline on how to do this, there are many ways you can do this

Things you will Need:
  • Wire
  • One 30 Amp Relay
  • One 20 Amp Fuse and Fuse holder
  • Two Splice Connectors and two Spade Connectors
  • Two eye connectors
  • A couple screws (to mount devices)
Wiring Diagrams:

This is the diagram of the composite headlight system w/o driving lights.


Here is a small diagram for the headlight mod.


Lets Get Started!

1. Determine where you are going to place your fuse holder, relay, and where you are going to splice into. Cut each wire long enough. You will need to run to battery positive (with fuse), a ground of some sort (behind relay or fuse mount), and to the two spliced connections in harness.


2. Run your power wire from battery to your relay, not forgetting to install a 20 amp fuse.

3. Splice into the harness with your splice connectors. The wire colors should be Tan and Light Green. Connect your wires and run them to your relay. Installing them in the proper place on the relay (see diagram).


4. Connect all wires properly to your Relay and run the ground behind the mount for relay or fuse. Mount Relay and Fuse holder securely.

5. At this time test to make sure everything is working properly. Low beams, then when High beams are clicked on you should have both High and Low beams turned on. If it does not work properly check your fuse and make sure all your connections and ground are good. Also, make sure that you properly placed wires on the right places on the relay.

Here is how my setup looks before I taped it all up.


You may add a switch in this setup but I didn't add that in this guide as I didn't install it because I didn't want it lol.

This guide isn't completely finished, I want to get pictures of the connectors themselves for you guys and will clean up the guide a little bit sometime during the week...


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Last edited by Green Machine; 09-14-2009 at 10:59 AM.
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Old 09-14-2009, 08:59 AM   #2 (permalink)
maddogg10mm
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Great post! I was looking at doing this mod myself & this post will really help me out. Thanks

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Old 09-14-2009, 11:07 AM   #3 (permalink)
Bison
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Theres a far easyer way of doing this.

I got an old style foot dimmer switch on the floor,one wire to a Key on only power supply from the underdash convieniance center to the switch,one wire from the switch spliced into the high beam green wire in the dr side fender harnass.
This setup will also turn on the blue high beam on light in the dash.
It works fully independant from the high/low lever wich stays fully operational as well.

I installed this set up in all my GM trucks and cars for yrs allready.
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98 GMC 2500 hd sle 6.5td ext cab l box 4x4 auto 4.10 difs 268000 km. HOME REBUILD ENGINE at 268.000 km,currently 307.000
Removed CDR an installed PROVENT CRANK CASE OIL SEPERATOR/VENTILATION VALVE,3 1/2" straight pipe.
PMD heatsink relocated to inside air stream in pass fender between batt and air filter.PMD is easely accessable.
Other mods, to nummerous to mention.
95 GMC SL 2500 6.5td ext cab sh box auto, 409.000 km,CDR vented to atmosfeer at 307 k, remote pmd, extra glow bypass/LP test switch, relocated OPS ,in cab fuel gauge .High idle switch,new paint.Foot dimmer swich for simultaniously high/low beam. The Wife's pride and joy.
89 GMC 2500 sle 4x4 ext cab 6.2 na stock 740000+ km, engine rebuilt at 660000 km, rusting out now, but runs like new.
Waldon Wheelloader repowered with 6.2 na.
3 tractors dsl ,72 AC 940 whj loader,ASV 4810 Positrack skidsteer
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Old 09-14-2009, 12:22 PM   #4 (permalink)
Green Machine
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Bison I wouldn't consider that far easier. Just a different way of doing it. Still about the same level of difficulty, just your way eliminates the relay it looks like.

Like it says on the top of the guide, "This is just a guideline on how to do this, there are many ways you can do this"
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Last edited by Green Machine; 09-14-2009 at 12:22 PM.
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Old 09-14-2009, 12:33 PM   #5 (permalink)
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Mike and I had a discussion on this before about doing this with a simply Diode as well...there's many ways to do it, and each person will find a way that each is hard and each is easy...it depends on your experience and knowledge level. as well as willingness to mess with stock wiring.
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Old 09-14-2009, 04:40 PM   #6 (permalink)
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Hey Mike I'm having a problem doing this to my truck... I can't find the wires you pointed out and ironically all my lights are on anyway...

oh wait this doesn't concern me












on a more serious note -awesome writeup. A+
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Old 09-14-2009, 05:11 PM   #7 (permalink)
mpm
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headlights

Diode is a cleaner way of doing this.Can be concleded in factory harness.Minimal wiring needed.
A diode is a 1 way valve for electricty.
1 side can be hooked up to positive on high beam and other side on positive on low beam,When high beams are on 12 volts flow over to low beam positive. When low beams are on the 12 volts cant flow over to the high beam side because of the 1 way valve effect of the diode.No relays to wire up or make heat and burn out.
Radio shack sells for under $5.00.
I will try on wifes taho this weekend.
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Old 09-14-2009, 05:16 PM   #8 (permalink)
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Quote:
Originally Posted by mpm View Post
Diode is a cleaner way of doing this.Can be concleded in factory harness.Minimal wiring needed.
A diode is a 1 way valve for electricty.
1 side can be hooked up to positive on high beam and other side on positive on low beam,When high beams are on 12 volts flow over to low beam positive. When low beams are on the 12 volts cant flow over to the high beam side because of the 1 way valve effect of the diode.No relays to wire up or make heat and burn out.
Radio shack sells for under $5.00.
I will try on wifes taho this weekend.
once again:
All on Headlight Mod Guide
Quote:
This is just a guideline on how to do this, there are many ways you can do this
Have a nice day
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Jamie

1998 Chevy C/3500 Cheyenne 4x4
CC/LB/SRW, 6.5 Diesel, Auto, Solid Front axle, AAM 11.5" Rear


1995 GMC K/1500 SLE 4x4
RC/LB/SRW, 6.5 Diesel, Auto

1982 Chevy C-60
350sbc, 4speed, F-106 rear, 12ft stake body
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Old 09-14-2009, 05:21 PM   #9 (permalink)
Trios
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Quote:
Originally Posted by Bison View Post
Theres a far easyer way of doing this.

I got an old style foot dimmer switch on the floor,one wire to a Key on only power supply from the underdash convieniance center to the switch,one wire from the switch spliced into the high beam green wire in the dr side fender harnass.
This setup will also turn on the blue high beam on light in the dash.
It works fully independant from the high/low lever wich stays fully operational as well.

I installed this set up in all my GM trucks and cars for yrs allready.
You're not taking into account the amp draw of the lights from whatever 'key on only power' you're taking it from. Easy way to blow a fuse here, just turn on your high beams with, say, your fan blower on high and POW, blown fuse.

Pulling the power from the always-hot headlight fuse would be better as I believe they're rated enough for both lights (some cars/trucks you can even find a sweet spot with your dimmer switch where both are on without a mod, but you gotta hold it there). This would also allow you to keep the all-on while the engine is off, which I suppose could be useful sometimes? Dunno.
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Trios is right.
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x2 Trios is right lol
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Old 09-14-2009, 11:03 PM   #10 (permalink)
Bison
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never blew a single fuse yet after 15 yrs of use on my 89. this truck dont have daytime running lights so my high beam substitutes for that. So these lights are on all the time i 'm on the road,I burnt out a couple bulbs over the yrs though.

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98 GMC 2500 hd sle 6.5td ext cab l box 4x4 auto 4.10 difs 268000 km. HOME REBUILD ENGINE at 268.000 km,currently 307.000
Removed CDR an installed PROVENT CRANK CASE OIL SEPERATOR/VENTILATION VALVE,3 1/2" straight pipe.
PMD heatsink relocated to inside air stream in pass fender between batt and air filter.PMD is easely accessable.
Other mods, to nummerous to mention.
95 GMC SL 2500 6.5td ext cab sh box auto, 409.000 km,CDR vented to atmosfeer at 307 k, remote pmd, extra glow bypass/LP test switch, relocated OPS ,in cab fuel gauge .High idle switch,new paint.Foot dimmer swich for simultaniously high/low beam. The Wife's pride and joy.
89 GMC 2500 sle 4x4 ext cab 6.2 na stock 740000+ km, engine rebuilt at 660000 km, rusting out now, but runs like new.
Waldon Wheelloader repowered with 6.2 na.
3 tractors dsl ,72 AC 940 whj loader,ASV 4810 Positrack skidsteer
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