wiring fog lights to headlights

[RonD]

I mounted aftermarket spot lights in my grill, and at the moment I spliced into the high beam wire. I noticed the actual spotlights are dim when wired into the lights vs the battery. Any fix for that or will I just have to run a switch.

You are running too many amps through the wire.
Two lights on wire gauge for 1 light = bad

You will melt the wire or the light switch, best case the fuse will blow before the melting

That is what relays are for.
A relay doesn't draw amps(well very little), so can be connected to the "high beam" wire so when high beam is activated the relay closes.

Your battery wire connects to one of the the Open/Close relay contacts, and the added lights connect to the other open/close contacts.

Relays are rated by how many amps the can pass, so get one that can handle the power.
You should also add an inline fuse on the battery cable to the relay, in case of a short, don't want to melt that battery

 

[mitch4x4]

Thanks for the info! just to clear it up I don't have both lights into the one wire they are running off of both high beam wires if that makes any difference.