Heavy Duty Headlight Harness and 4 Hi

[Purefection]

I got some time to quickly draw up a schematic for the heavy duty Headlight harness with and without 4 hi mod, using the 2 relay method and the 3 relay method.

This is a quick drawing on my phone so excuse the poor lines. Will make it better once I make sure this work.

I think if I can get a good line on materials I will start making these. As an Electrician I can get some pretty good deals on all of this.

Any input on the drawings is appreciated.


4 hi harness (3 relays)

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No 4 Hi

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I may have the green and brown backwards to what they are on the truck, but it's irrelevant. The stock connector is obviously male, so there would be a new male connector there. The new connector at the bulbs is male.

All black line is to ground. Red is 12v+ DC from battery, with a 20 or 30 amp in line fuse shown in blue.

 

[thz71]

I only used one relay for my 4 hi

 

[98_k1500]

You could pull power from a single 40 amp circuit breaker (thats how i have all my accessories run) instead of having 3 or more fuses at the battery. If your truck is a vortec, pull power from the feed to the under hood fuse box and mount your relays on the fender well where the extra battery tray is for a factory-clean look.

 

[Purefection]

Good call on the one battery feed. And this is not just 4 hi, it's barons heavy duty harness.

 

[98_k1500]

As far as i can tell, the first one is identical to mine. (with the addition of a fog light relay)

 

[Purefection]

Ive never had one of barons harnesses so I'm not sure if he did anything special, but that would work identical to his.

Battery feeds direct power to both lights, as well as makes the 4 Hi mod. When I get home I'll see if I can round up enough parts to make a few and try them out. Maybe I'll start selling them on the side.

 

[98_k1500]

I assume thats how his is, thats how i wired up mine. Works perfect. Those relays are expensive if you get good ones.

 

[Purefection]

I can get them wholesale and with a contractor discount for pretty reasonable. What was he selling them for?

 

[98_k1500]

Now that I do not have a clue.

 

[bluex]

The hd harness with 4hi was $95 iirc