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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-11-2005, 01:35 AM   #1
Clockwork
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Join Date: Feb 2005
Location: Airdrie, Alberta, Canada
Posts: 428
My Ride: E46, E31, E53
general relay question

hi folks. I am hooking up a set of fogs to my friends car. I have a simple question or two actually
1) the relay I have has 4 wires
a-black with a circular eyelet to be screwed into chasis for ground
b-white that leads to the wiring to the foglights
c-white with a female connection piece to connect to the rear of a toggle switch
d- white with an in-line fuse and a circular eyelet to be connected to???
I am thinking a battery? is this true?

2) also I am thinking of setting up the red wire from the toggle switch to night lights wiring. BUT this car only has one bulb for high and low beams. will this be an issue for me when she turns on the high beams in the car? (ie too much power going through the wire now) OR does this red wire (that is connected to the night time/high beam bulb), just act as a remote wire basically, to trigger when the foglights should also get power?
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Old 12-12-2005, 01:20 PM   #2
ca1242
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Join Date: Aug 2003
Location: Burke, VA
Posts: 7,633
My Ride: 2003 330i
Without looking at the relay and checking things out myself, I can't be 100% sure, but I most likely (99% sure) it dies go to the battery.

There is no such thing as too much power going through the wire. The relay and fogs is designed to work at 12 volts (14 volts when the car is running). If you are unsure whether the wire will work (some car manufacturers either use a switched signal or lower voltage for daytime running lights), check with a voltmeter.
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Old 12-16-2005, 01:29 PM   #3
WishIHadAStick
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Join Date: Nov 2005
Location: CT
Posts: 48
My Ride: 2003 330xi
for #1, it's got to be for the battery, or some other power source. Where else wouldit get power from?
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