PIAA 510 Relay

[Flounder]

Bill,

Not using the PIAA switch. The OEM switch has a line in and a ground out to break the circuit. The switch itself pulls no power, and does not have a "power out" prong per se (though I assume it is, simply, like a U where line in and ground out don't matter as much as generally the breaking of one leg of the circuit). But, I suppose I could run power in and tie the ground out on the switch (here, it would function as power out) to the coil power in (essentially having the OEM switch break the power prong of the line, instead of the ground), but I also assumed since the OEM switch was built to break the ground side of the circuit (I think this is how Ford wires it), I would run and break the ground wire instead.

I think--breaking the ground side of the circuit has the same effect as the power, right? Essentially, unless the circuit is completed, that is, power flows to item and to ground, the circuit will not fire. In this case, the on/off of the OEM switch makes or breaks the ground leg of the circuit, either allowing or prohibiting it from grounding, and thus allowing or prohibiting the coil to fire.

I wish I paid more attention in Hon. Physics. So... long... ago...

 

[410Fortune]

why not just tap into the fog light relay behind your passenger headlight instead of behind the dash at the switch?
I didnt touch my interior switch when I added fog lights, all the wiring was done under the hood and I can turn my fogs on with parking lamps, hi and low beams (thanks to the wiring help I got on the forum)

you could easily piggyback seperate relays or the piaa relays using the factory relay to do all the turning on and off

 

[Bill Kemp]

Now I understant and you are right. Your new switch will interupt the power from the parking lights to the PIAA relay.
Sounds good.

410, Wasnt stated here but he is putting in another OEM style fog light switch. The new switch will take the place of the PIAA switch.

 

[Flounder]

why not just tap into the fog light relay behind your passenger headlight instead of behind the dash at the switch?
I didnt touch my interior switch when I added fog lights, all the wiring was done under the hood and I can turn my fogs on with parking lamps, hi and low beams (thanks to the wiring help I got on the forum)

you could easily piggyback seperate relays or the piaa relays using the factory relay to do all the turning on and off

410,

I'm doing something with this:

Adding a switch and making it uber-OEM. My 04's fog lights are turned off and on using the headlight switch, a'la the F series. There no longer is a switch on the right of the radio.

 

[410Fortune]

copy that, clean install time, me likey