3 pin Molex wires: Red, Yellow, Black

Luie · 08-28-03, 06:38 PM

I think I 7Volt modded my fan today.

Got a question out of curiosity even though the fan is quieter now:

Is the 3 pins Molex wires' "color symbol" from the fan the same as the 4 pin ones from the PSU?

Red = 5V
Yellow = 12V
Black = Ground

3 pins connector

4 pins connector

The reason why I'm asking is because I'm confused why there are 3 wires from the fan (red, yellow and black). I am wondering if one of them is the fan's RPM sensor.
After my mod, the BIOS no longer shows the RPM of the fan so I think the color code of the wire is not the same?...or the PC detects the RPM in another way?

Mr. $T$ · 08-28-03, 06:56 PM

Some three pin fans have strange color scheme but the rule usually is that the red is the postive "hot" wire and the black is the ground wire, and the other color which is usually yellow is the RPM wire.

Cjwinnit · 08-28-03, 06:57 PM

Yep, the three fans wires are 12v, 0v and Sensor.You have to connect the sensor wire to the header on the motherboard to read the RPM, the molex connector has no rpm wire. You could connect thr 12v and 0v wires to the molex and the sensor wire to the mobo connector.

If you volt-mod the fan do not use the sensor wire, you could damage the motherboard if the sensor wire pumps out the wrong voltage.

Luie · 08-29-03, 12:22 AM

icic.
Thanks for the clear up.

four4875 · 08-29-03, 08:50 PM

the sensor wire normally sends pulses of ground, so pulses of 5 volts (from moddin the fan) could mean owies for both the fan and the motherboard.

08-28-03, 06:38 PM	Thread Starter #1
Luie Member Join Date: Sep 2001 Location: Irvine, CA	3 pin Molex wires: Red, Yellow, Black I think I 7Volt modded my fan today. Got a question out of curiosity even though the fan is quieter now: Is the 3 pins Molex wires' "color symbol" from the fan the same as the 4 pin ones from the PSU? Red = 5V Yellow = 12V Black = Ground 3 pins connector 4 pins connector The reason why I'm asking is because I'm confused why there are 3 wires from the fan (red, yellow and black). I am wondering if one of them is the fan's RPM sensor. After my mod, the BIOS no longer shows the RPM of the fan so I think the color code of the wire is not the same?...or the PC detects the RPM in another way? __________________ Click HERE for my Heatware mobile(): ..MacBook Pro 13" 2010 ..Droid X network(): ..CA.parts.FOR.SALE = Visiontek TV Wonder HD650 + Wii ..WA.apartment = i7 930 + 12GB PC3-12800 + 160GB SSD + 1.5TB HDD + Sapphire HD5770 +Gigabyte X58A-UD3R ..CA.hometown = i5 2500K + 8GB PC3-10600 + 120GB SSD + 3TB HDD + Asus EAH3450 + ASRock Z68 Pro3-M + KWorld ATSC-110 HDTV imma_Black belt Ubercloxx0r
	QUOTE Thanks

08-28-03, 06:56 PM	#2
Mr. $T$ Member Join Date: Sep 2001	Some three pin fans have strange color scheme but the rule usually is that the red is the postive "hot" wire and the black is the ground wire, and the other color which is usually yellow is the RPM wire.
	QUOTE Thanks

08-28-03, 06:57 PM	#3
Cjwinnit B& Join Date: Jan 2003 Location: France	Yep, the three fans wires are 12v, 0v and Sensor.You have to connect the sensor wire to the header on the motherboard to read the RPM, the molex connector has no rpm wire. You could connect thr 12v and 0v wires to the molex and the sensor wire to the mobo connector. If you volt-mod the fan do not use the sensor wire, you could damage the motherboard if the sensor wire pumps out the wrong voltage. __________________ -= Maths Ninja =- Official Modding Xaser III thread resurrecter. "LIES! THE ONLY THING MORE AWESOME sounding THEN SEVERAL DELTAS AT 60+DB IS THE SCREAMING OF MERE MORTALS AS THEY GET TOO CLOSE!" -freakdiablo
	QUOTE Thanks

08-29-03, 12:22 AM	Thread Starter #4
Luie Member Join Date: Sep 2001 Location: Irvine, CA	icic. Thanks for the clear up. __________________ Click HERE for my Heatware mobile(): ..MacBook Pro 13" 2010 ..Droid X network(): ..CA.parts.FOR.SALE = Visiontek TV Wonder HD650 + Wii ..WA.apartment = i7 930 + 12GB PC3-12800 + 160GB SSD + 1.5TB HDD + Sapphire HD5770 +Gigabyte X58A-UD3R ..CA.hometown = i5 2500K + 8GB PC3-10600 + 120GB SSD + 3TB HDD + Asus EAH3450 + ASRock Z68 Pro3-M + KWorld ATSC-110 HDTV imma_Black belt Ubercloxx0r
	QUOTE Thanks

08-29-03, 08:50 PM	#5
four4875 Member Join Date: Jan 2003 Location: I can see walmart, 44906	the sensor wire normally sends pulses of ground, so pulses of 5 volts (from moddin the fan) could mean owies for both the fan and the motherboard. __________________ Student of Electronic Engineering as of September 20, 2010
	QUOTE Thanks

3 pin Molex wires: Red, Yellow, Black

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