wiring fan to ignition...(bad idea)
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
Originally Posted by MattB
from that schematic i can see that the relay is on the ground side. this must mean that if i have 12 volts then the relay could be broken. since i dont even have the 12 volts i dont need to worry about that until the fan has the 12 volts it wants. cant i just run a new 12 volt line and that would make it work like normal?
Proibably. Like I said before, there are several plugs that are not in use around the area of the relays. USUALLY the power wire in a plug will be BLACK/YELLOW or BLACK/WHITE. Those wires usually are only active if the key is to ON. I'd buy some wire taps from radio shack and put one on the YELLOW wire on the harness connector of the fan plug/s. Tap it to one of the wires I just mentioned and turn the key to ON. If the rest of the system is there, the fan will turn on if the green/black wire is off the water temp switch on the thermostat housing.
HAVE YOU EVER SEEN THIS FAN WORK BEFORE?
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
Originally Posted by MattB
okay so if my car runs...that gets rid of part of what could be a problem...my wipers work...that eliminates more....whats next? thermostat?
im assuming that if i supply 12 volts there the fan will work like normal. from what i understand....the way it is activated is by some control supplying ground. 12 volts is always there and its just waiting for a ground connection.
since my 12 volts isnt there i guess thats my next step. get the required 12 volts supplied and then it should work. if not that means there is some sort of grounding problem....
im new to car so is this correct?
im assuming that if i supply 12 volts there the fan will work like normal. from what i understand....the way it is activated is by some control supplying ground. 12 volts is always there and its just waiting for a ground connection.
since my 12 volts isnt there i guess thats my next step. get the required 12 volts supplied and then it should work. if not that means there is some sort of grounding problem....
im new to car so is this correct?
If the green/black wire is pulled off the temp switch, then a relay will never be pulled in and the result is that relay (in the cotrol unit if I remember right) will put a ground on the fan and it should run.
EDIT: OOPS. No. When you pull the green/black off you remove a source of ground for the fan relay which makes it relax. That in turn supplies a ground thru the fan relay to the Control Unit. Actually the ground seems to be from the control unit thru the fan relay to the fan. Anyway, you can now see why IF the green black wire is off the temp switch WHY the fan would/should come on.
Last edited by HAILERS; Jun 27, 2005 at 01:40 PM.
Thread Starter
MattB
Joined: Apr 2005
Posts: 1,124
Likes: 0
From: Haverhill, MA
ok well i ran a new 12 volt line to where the old one was because the old line was supplying 3 volts...the fan works great now...started as soon as i took my little green wire off....thanks for the help HAILERS...
-Matt
-Matt
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