This is the best set up I have seen yet, love the quick disconnect for bypassing the relays.

Very timely video, Jeff. I need to set up headlight relays (two bulb only on a tractor). Your overview filled in several blanks in my plan.

Nice to see some love for the 68/68 Fairlanes. I need to do this to my 68 Fairlane.

You can do it with a 4 pin and a 5 pin also. Power the 30 on the 4 pin and 87 to power the 30 on the 5 pin. Trigger 86 on the 4 pin with low beam and 86 on the 5 pin with high beam. Tie both 85's to ground, low beam to lights is 87A on 5 pin and high beams is 87 on 5 pin. A 4 pin relay is on/off where a 5 pin is one or the other, with 30 powered and 86 not energized power flows through to 87A, when 86 is energized flow switches over to 87. This gives you high and low from one relay.

You can also fill the back of the plug side with hot glue or silicone to seal them and then use dielectric grease on the plug to the relay.

so great and clear way to explain thanks

what I did to hide the relays was to get a old voltage regulator and gut it, then mounted the relays inside and made a cut relief for the harness. I mounted it about where you did though. Good job tho !!!!!

Thank you for this tutorial, the high beams started flickering on my Lincoln Continental after I hit up the car wash...

Great video, sort of vehicle specific, but that's okay with me! Gave me some ideas to apply to my '05 Prius tomorrow! Going original HID headlight to halogen. Needs a relay. Thanks! Soldering comment: you did it but didn't say it... you let the heatened wires melt the new solder instead of having the solder iron melt the solder. Great! Then shrink tube, etc. That's how I like to join wires!!

Very good!

just came over from your Ford Electrical Problems video....bring back the mop top!!!!

Thanks for all the great little tips. Lots of knowledge transfer! You sid this was specifically for Ford products, It seems like it would be pretty applicable to GM products as well. Any particular gotchas you had in mind if I apply this to my 67 Firebird?

If you are running 100 watt halogen bulbs on high beam you will need a 40amp relay for the high beam relay and 40amp fuze or breaker

86+

I made a headlight relay harness for my 1968 Mustang but I used a male headlight plug to connect to the original wiring instead of cutting the harness to go to the relay then I ran wiring to both head lights with new ceramic headlight plugs for the added heat of halogen headlights. The headlights are way brighter than original and I didn't have to cut the harness.

Thanks that's amazing great video channel nice ideas I like it blessing

very good info much appreciated

There are those who say even when you install a CB Radio or 8-Track in your car you should use a relay.

I would DEFININITELY stay away from the cheap relays, Chinese relays whatever. And also keep a couple spares in the car. Best thing to do, go to the junkyard. Chrysler Minivans from the '90's used that basic Bosch relay for bunch of things and they plugged them into the fusebox right near the column. They're high quality made in Germany OE relays. I grab a handful every time I go and see one of those. I use 'em for everything. Had the cheapo ones fail on me before on night on a trip. Burned up at 1/3 the rated load. Not good.

Hey Buddy, thanks for the vid. I got a '79 Lincoln and my relay prob got fried. It has a 5 pin relay, but noticed that the wires(green/black, red/yellow, red/black) to the relay are extremly hot. I want to use this vid to modify my headlight/high beam harness but not sure which relay i should pick (40A?)... just want to be sure that my car doesnt get a fire...