Hey yall!

I am making a relay harness for my HID light upgrade on my 2001 S-Crew 5.4
Here is what I am doing (nothing installed yet)
1: Projector headlight upgrade (H1 bulbs)
2: HID kit (8000K)
3: Relay harness (making myself)

1: is it better to run the harness directly off the Batterie or directly from the altenator?
2: I need to use an "in line" fuse between the power source and the relay (What size fuse should I use?)

Thanks in advance for any advice!

 

Hello..... Anyone......

Any help would be greatly appreciated!

 

Do you know how fuses and relays work, or is this what you're asking? Fuse/relay just Google. Basically a wire goes from the battery to a relay and its second half goes from the relay to the lights. Another wire with much less current goes to the relay and turns the relay on or off, turning the lights on or off.

Like a light switch.

Relays have fuses built into them. Figure the amperage on the fuse by dividing watts by volts and you need somewhat bigger than that. So 100Wx2, 200W divided by 12V or 13.3V battery or whatever you have, and that's your amperage that you need, the minimum.

Use thick wires; check good gauge (thickness). Or put in 10 AWG or 8 AWG and that's plenty for lights, I think. Costs three bucks at Walmart for 12 feet (10 AWG).

What else you need?

 

Does this help? It's the relay harness I bought from retro solutions. Connect it to the battery. I think the fuse is a 25 amp one, but I can check.



Granted, this is for single beam, which I think the H1 is.

 

Thanks yall!!!!
I really appriciate the info!
Fordgirl18, I just wanted to know what size fuse I need for the in-line fuse coming off the power source!

Thanks for the formula!!!!!

 

I think my old HID set had a 10A for the whole thing and each balast had a 5A fuse, I will look tonight.


EDIT: 20A for the whole thing and each side had a 15A fuse.