How to wire in a regular 2-wire fan.
07-20-2005, 04:23 PM
#1
Admin v2.0
Thread Starter
iTrader: (9)
Join Date: Nov 2002
Location: Alameda, CA, USA
Posts: 6,965
Car Info: 02 Black Legacy GT
How to wire in a regular 2-wire fan.
I can no longer use OEM style fans due to clearance issues. So I got a slim fan. It has 2 wires only. Both stock fans have 3-wires each...
What is the best way to wire in a single 2-wire fan instead of 2 3-wire OEM ones?
What is the best way to wire in a single 2-wire fan instead of 2 3-wire OEM ones?
07-20-2005, 04:25 PM
#2
3 wires? That's really wierd - do you know where to get a wiring diagram for the oem fans?
If not, you can use an ohm-meter to check where the connections are going to. Find the two terminals on your old batteries that are connected and appear to have around 100ohms (or less) between them. These will be the wire windings for the fan. Just make sure the resistance is not really really small as that would indicate that the lines are shorted. Once you know which two connect to the windings, just wire up the new ones in place of those.
I really should mention that I have no idea what the 3rd wire would be for in a fan, unless these fans have some sort of feedback to indicate their speed or something else. I can't find a wiring diagram for the two oem fans so i'm just going off my gut. If you know where one is to verify this, that'd be great. let me know
If not, you can use an ohm-meter to check where the connections are going to. Find the two terminals on your old batteries that are connected and appear to have around 100ohms (or less) between them. These will be the wire windings for the fan. Just make sure the resistance is not really really small as that would indicate that the lines are shorted. Once you know which two connect to the windings, just wire up the new ones in place of those.
I really should mention that I have no idea what the 3rd wire would be for in a fan, unless these fans have some sort of feedback to indicate their speed or something else. I can't find a wiring diagram for the two oem fans so i'm just going off my gut. If you know where one is to verify this, that'd be great. let me know
Last edited by musashi; 07-20-2005 at 05:39 PM.
07-20-2005, 08:46 PM
#3
Admin v2.0
Thread Starter
iTrader: (9)
Join Date: Nov 2002
Location: Alameda, CA, USA
Posts: 6,965
Car Info: 02 Black Legacy GT
Each fan has 2 speeds. There are like 6 different modes for two OEM fans depending on the vehicle speed, AC on/off, water temp, ect. The 3 wires on each fan are to allow the fans to operate at 2 different speeds depending on conditions.
07-21-2005, 06:55 AM
#7
Registered User
iTrader: (14)
Join Date: Nov 2001
Location: Peoples Republik of Kalifornia
Posts: 14,221
Car Info: 05 H2 SUT, 45 GPW, 10 Murano, 13 Boss 302
Originally Posted by Imprezer
Ok, and what would be which wire? 
Wiring it this way, the fans would come on for the low or high speed signal from the ECU, which is what you want.
Thread
Thread Starter
Forum
Replies
Last Post
rorey
Car Lounge
0
04-23-2003 04:04 PM
