How To Wire Relays For Bright Headlights....

[ChiefRocka]

Here you go....A nice Diagram on HOW TO ADD RELAYS TO YOUR HEADLIGHT CIRCUIT.




It's actually a pretty basic install. The best place to mount the relays is next to the Horn relay area (LF fenderwell). I recommend replacing the power-wire from the battery to the horn relay with at least a 10 ga. wire. (If it's not already)

You can now run your fuse/breaker off of the power terminal of the Horn relay.

You can then unplug the headlight harness at the radiator support, and connect those wires to the relays, according to the diagram. You can use blade terminals to insert into stock harness, that way you won't need to cut your harness. (unless you want to).

The LO and HI relay output terminals (87) will now plug into the stock plug in the rad support.

You now have FULL BATTERY LOAD to your headlights...and as Bryan59 mention, have a cooler harness under the dash !!!!

Hope this Helps !!!

John

[19GMC63]

I have a few questions.
What size fuse should be used? What about relays?

Also, I have a 50amp maxi-fuse to protect my harness (mounted on RF fenderwell). Should I run the power wire before or after the maxi-fuse?
If after, would that allow me not to run a fuse in the power wire?

thanks John, this will help a lot.

Andrew

[HugrOrang71]

Most of the standard accessory relays are of the 30 amp variety. Should be plenty sufficient for even the higher wattage aftermarket headlights.

I would also run a 30 amp circuit breaker instead of a fuse. In case of a intermittent failure or overheated circuit (other than a direct short to ground), you will still have limited use of the headlights.

Jason

[ChiefRocka]

Originally Posted by 19GMC63

I have a few questions.
What size fuse should be used? What about relays?

Also, I have a 50amp maxi-fuse to protect my harness (mounted on RF fenderwell). Should I run the power wire before or after the maxi-fuse?
If after, would that allow me not to run a fuse in the power wire?

thanks John, this will help a lot.

Andrew

I would run the power wire after the 50amp...but still thru another fuse/breaker (30amp fuse and relays). This way the 30 would trip, and not the main 50...which would cause you to loose everything. Just as metioned above...a breaker is preferred (during an intermintant problem, the headlights would flicker off temporarily) This way you could safely pull over, for example.

John

[ChiefRocka]

As a matter of fact...they make 30amp relays with built in 30amp fuse holders...those are trick.

Can't remember if they're Bosch or Hella

John

[19GMC63]

cool, thanks for the info man.

Andrew

[ChiefRocka]

Your welcome

[wild one]

Nice diagram and instructions John, this is one that I will bookmark for future use! This ought to be moved to the FAQ section for future use - that way it doesn't get "lost" in the threads. Just my .02

[scottyweeez]

Howboutcha' Chief? Do aftermarket harnesses already have this "upgrade" or will this work on them also? Good lookin' ride, Bro!

[ChiefRocka]

Originally Posted by scottyweeez

Howboutcha' Chief? Do aftermarket harnesses already have this "upgrade" or will this work on them also? Good lookin' ride, Bro!

They dont have this upgrade...but it will work with the new harness'...and also other vehicles as well.

Thanks...it's coming along !!



John

[ChiefRocka]

Originally Posted by wild one

Nice diagram and instructions John, this is one that I will bookmark for future use! This ought to be moved to the FAQ section for future use - that way it doesn't get "lost" in the threads. Just my .02

I posted it there also...will it remain there ??

John