SWT RD
I did not understand the new fog lights actually use the old fog lights (2 wires) and are just adding the halo light (2 wires) I assumed the new light had both built in (4 wires). And you want the halos on all the time the key is on.
Now that I understand further - here is some more information
Normally these are the connections you need at the relay:
- A negative connection to a local ground
- The connection from the power switch to actuate the relay
- One connection for each power leg of the fog light
- One to the high power input that you are using from the fuse box.
The negatives at the fogs should be connected to local ground. This above connections would use the 5 leg relay.
Dragon
I think a 4 terminal relay is what he would want -- your third statement may be confusing to some if they have never wired a five terminal relay.--
One connection for each power leg of the fog light
Picture 1 -- terminal 87 is the one you should connect to
both halo lights - if you connect each halo light to a separate terminal (87 and 87a) - one light would always be on and the relay the would then just switch which light comes on.
I know you know how this works but I was concerned others might not connect it correctly.
Please see picture 2 regarding relay wiring and I would recommend a 4 terminal relay
in your case you would connect terminal 86 to ignition switched power.
then run terminal 87 to the red wire of both halo lights, black of halo would connect to local ground as dragon said.
This would also require an inline fuse on wires from terminals 86 and 30.
I am not even sure if you need to use a relay -- you never replied what the wattage of the halos are. If only 10watts as I questioned earlier - your idea might be fine if you used a 2 amp inline fuse and depending on the circuit you tapped into.
Another word of caution DO NOT EVER use a fuse box tap shown in picture 3-- these can damage the female terminal in the fuse box !!!!
instead use the one similar to picture 4 (not sure if it would clear fuse box cover ?) with an inline fuse connected to the protruding wire.
EDIT -- info added
Relays were required when using incandescent lights which require more current (amperage) -- your halo lights are most lightly LED and are a low power with a small current draw? -- again you never mentioned the wattage.