87 t-66

iTrader: (133)

I know this is probably a simple question but i would like if someone could give me some input on how this would all work. I would basically like to have the s5 fog lights and jdm ftp's wired into the stock fog light switch. I have attached a simple diagram and would appreciate it if someone could connect the wires for me. I think i know what needs to be done but would like a 2nd opinion.

Acesanugal

iTrader: (5)

On my car, the previous owner tapped into the secondary light harness up under the dash before it gets to the switch itself. A single wire runs from the harness to the lights up front, which are grounded to the chassis. When the parking lights are on, so are the fogs, but they go off once the headlights pop up.

87 t-66

iTrader: (133)

i would like to use the switch.

RacerXtreme7

iTrader: (2)

here ya go!

~Mike.............

EDIT: Ohh yeah, add a fuse too!!! Put it close to the battery on the relay + supply line. Use a fuse like 5 AMPs higher then what your total draw will be.

~Mike...............

RacerXtreme7

iTrader: (2)

Make sure to use sufficeint wire gauges for power to the relay and to the fogs/FTP and use simular ground size (like 12 AWG.). The switch wire can be smaller in Gauge (like 22 AWG.). Make sure the relay is rated for the amount of current you'll be drawing from it, add both fogs and FTP's for total wattage/current draw and make sure your relay is rated HIGHER.

http://www.lunghd.com/Tech_Articles/...ay_diagram.JPG


~Mike..............

87 t-66

iTrader: (133)

thanks a lot mike. i can ground the lights to the chassis right? i dont have to run it all the way back to the battery (relocated)? same with the relay? now to figure out how many amps these lights will pull..i cant imagine it's very much.

can i run the power wire like this so i dont have 2 wires going to the battery? or should it be on the other side of the fuse?

RacerXtreme7

iTrader: (2)

Ground is ground. You can ground the lights and relay anywere so as along as it makes good contact with the chassis all seperate or join them all at a common spot. Use the same size ground wires as you do + supply wires. Your switch power can come from anywere so long as its a + 12V source. i'd leave the + wire from your batt and fuse solid straight to your relay and not splice into it. What is the wattage of all the bulbs your using? I assume the fogs are H3 bulbs which are typically 55 Watters..... whats in the FTP lenses?

~Mike...............

RacerXtreme7

iTrader: (2)

Converting Watts to Amps:

The conversion of Watts to Amps is governed by the equation, Amps = Watts/Volts

For example 12 watts/12 volts = 1 amp

Lets assume all 4 bulbs are 55 watters.

55 X 4= 220 Watts

220watts/12v= 18.3 Amps.

So you'd use a 30 Amp relay and 25 amp fuse and you'll be fine.

~Mike..............

87 t-66

iTrader: (133)

sounds good. ill give it a shot on friday or saturday and post some pics of the final results.

87 t-66

iTrader: (133)

are you sure this is correct? i hooked everything up exactly like the diagram and i triple checked all the wires. doesn't the switch need to be ground on one end?

misterstyx69

iTrader: (142)

where the switch is located is a bit confusing...Adam..see if this diagram is any good.In this thread here..What you would do it parallel the circuits and put it to a switch(instead of high and low). https://www.rx7club.com/showthread.p...hts+on+a+relay

87 t-66

iTrader: (133)

thanks dave,

i am trying to use the stock fog light switch in the center console. i want it to be independent of the stock lighting system. the link you posted makes the diagram above look correct. time to get out the multimeter i guess.

RacerXtreme7

iTrader: (2)

I work at NASA and wire AIRCRAFT for a living amoungst other stuff (mechanical, aero, and machinest). Yes, this little diagram is correct, double check your stuff, good luck.

~Mike.............

EDIT: If you ground one side of the switch all you'd do is create a straight up SHORT and blow what ever source you pulled your 12v source from. Its a simple switch, all your doing is turning on or off a 12+ Volt source, the relay has a ground thus completing the circut when the switch is "switched".

RacerXtreme7

iTrader: (2)

I work at NASA and wire AIRCRAFT for a living amongst other stuff (mechanical, aero, and machinist). Yes, this little diagram is correct, double check your stuff, good luck.

~Mike.............

EDIT: If you ground one side of the switch all you'd do is create a straight up SHORT and blow what ever source you pulled your 12v source from. Its a simple switch, all your doing is turning on or off a 12+ Volt source, the relay has a ground thus completing the circuit when the switch is "switched".

oops, double posted after I edited my great grammar and spelling lol

skillzilla

iTrader: (1)

One thing I would suggest is use switched power to either the switch or (probably) the fused link to the relay, so the circuit would be off with the key off.

Turbo II Rotor

iTrader: (2)

3 month old thread.