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Discussion Starter · #1 · (Edited)
I've gotten a million pm's from people asking how exactly to do this modification. I enjoy helping others out so I'm putting together this thread as a how to. Mind you, this is for an 03 model year on up to 07. The new body style's are different.

Parts needed.

Diodes from Radio Shack. Part #'s 4001, 4002, 4003, or 4004. They're all basically the same and your only issue is gonna be the length. They're less than a dollar so its relatively cheap...

Everything runs from the low beam fuse. The low beam fuse has 4 pins, labeled with numbers. Take the 85 pin and run the diode with the bottle cap pointing toward the highbeam fuse 85 pin. You have to pull out the fuse and look at the numbers to make sure you're getting the right one.

After running the diode from the low to the high beam 85 pin, you now will be able to reain your low beams with the use of your highbeams.

Next, take the second diode and run it from the 85 pin of the low beam fuse and connect it to the 85 leg of the fog light fuse. You can wrap the diode around the leg itself, stick it in the hole or solder it, its up to you. Soldering it obviously is the best option since its gonna be a fail safe connection. Once they're connected to the 85 pins, you now will retain your fog lights with the use of your high beams as well.

Or....

You can take the diode and run it from the 85 pin of the highbeams and connect it to the 85 pin of the fog lights. Now you'll be able to retain your fog lights, when your low beams are on.

Some people use the DRL's as well. Some people may think that this could overload the circut. I opted not to use my DRL's because they dont put out much light anyways and I didnt want to fry anything.

As always, if you get lost, pm me and I'll walk you through it over the phone.
 

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A note for plow guys.......

Also install a switch. That way you can disable this deal. Most plow lights run a high/low bulb and I doubt it would be happy running both filaments in the same bulb at the same time. Or just dont ever use your high beams when the headgear is attached......

JK. Actually I was going to look into if the 06 and my 03 were the same and would work. Since you did this on your LBZ I'd say I am safe :D
 

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With this set up can you run the low beams only? I have both diodes coming off the high beam relay that way I still get all on, activated by the high beams. Then the options of low beam only, low beam plus fog with the switch on the dash, and fog only.
 

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Waco Kid, I sent you a PM.

Unit, what size are these diodes? It seems Radio Shack no longer has stores in Canada, so I guess I need to grab them elsewhere.

You guys say you're "playing" around trying to find what works. How much damage can one do by playing around with different combos of diodes? I basically want to achieve all headlights on when I flip the toggle activating the high beams so then the lows would just stay on. I'd preferably like to have separate control over the fogs if it's possible.
 

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Discussion Starter · #6 · (Edited)
Part #'s 4001, 4002, 4003, or 4004.

I dont know what to tell you if Radio Shack dosent have them....
 

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2002

Hey there Unit453 will this work on my 2002 or have we figured out a way to wire the 2002 to make it work i would really love to get this done
 

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do these diodes interfere with the "auto" function??
 

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Unit453;1986120; said:
Part #'s 4001, 4002, 4003, or 4004.

I dont what to tell you if Radio Shack dosent have them....
Check with an electronics component supplier like Mouser. The actual diode p/n is 1N4001, 1N4002, etc... You may be held to a minimum order quantity or $$ going through one of those places if Radio Shack doesn't have them.
 

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Discussion Starter · #10 ·
OhSixDuramax;1995115; said:
do these diodes interfere with the "auto" function??
Not at all...All it does is retain your low beams, and fogs when you turn on your high beams...

I disabled my "auto" function so I dont have to worry about big brother turning on my lights anymore...
 

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Unit453;1995812; said:
I disabled my "auto" function so I dont have to worry about big brother turning on my lights anymore...

HAHA I hope you are kidding?? I LOVE auto headlights, plus the truck has manual controls also...I can "disable" them whenever I want!! :D
 

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Discussion Starter · #13 · (Edited)
Im not kidding. I hate the cycle of the lights turning on while Im waiting for my glow plugs to warm up. On/off/on is not good for HID's so I wanted to either to put a timer to be able to turn my lights on later, like 30 seconds after start up, or simply disable it.
 

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Ohhh, I forgot about the wait to start on the older style plugs, that makes sense...
 

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Discussion Starter · #15 ·
Older style plugs?

I have an 07...

I just didnt want the lights to constantly flicker like they used to when cranking. I'd like to prolong their life as long as I can.
 

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Unit453;2000908; said:
Older style plugs?

I have an 07...

I just didnt want the lights to constantly flicker like they used to when cranking. I'd like to prolong their life as long as I can.
Why are you waiting for the plugs on a '07?? Also, cant you just turn the lights to the "off" position??
 

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Discussion Starter · #17 ·
I wait for the plugs because in the winter time, we have a couple months on end when its BELOW zero....Not much warms up fast in sub zero temps.

I went through it last winter when the truck was brand new.

And yes, I can adjust the lights, but you have to turn the controls, at the right second, when turning the key to the on position for the glow plugs. Its a 50/50 chance that they wont come on. PITA....Strip the wires to the sensor, run a jumper, problem solved.
 

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Unit453;2000930; said:
I wait for the plugs because in the winter time, we have a couple months on end when its BELOW zero....Not much warms up fast in sub zero temps.
I guess that makes sense, I dont think my truck has seen sub 50 degrees YET...LOL
 

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Unit453;1984845; said:
I've tried it a few ways with the diodes. When my low beams are on, my fogs are on. Its a one packahe deal. You can however just hit your fog light button and not get your low beams as well.
You can run just the lows if you want or just the fogs if you want but the highs will turn on the lows and fogs if you follow this config...

diode from pin #85 low beam to high beam pin #85. Then diode from pin #85 high beam to fog light pin #85.

Works like a champ!
 

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BigMoose153;2000971; said:
You can run just the lows if you want or just the fogs if you want but the highs will turn on the lows and fogs if you follow this config...
Not on my truck... :p:
 
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