Taurus E-fan upgrade. Electrical anomalies - JeepForum.com

 
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post #1 of 6 Old 06-04-2010, 09:30 PM Thread Starter
socko
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Taurus E-fan upgrade. Electrical anomalies

Short Version:
The electric fan is getting power directly from the battery via a solenoid, and controlled by thermostatic controller. If I apply the power to the HIGH (blue wire) side, my voltmeter reads that I am getting 16 volts coming out of the unused LOW (brown wire) side. If I switch it up and apply the power to the LOW side, the HIGH side has 8 volts coming out of it. This doesn't seem normal?

Longer Version:
A week ago I removed the stock cooling fan and I did the Ford Taurus electric fan upgrade. It has been working great thus far and I am very impressed with the results. But...

I have been running the fan on HIGH (blue wire) only, getting power directly from the battery via a solenoid and using a thermostatic fan control to turn the fan on and off based on temps.

After being satisfied with how everything was working, I decided to wire it up to take full advantage of both the HIGH and LOW speeds it offers. Before making any changes to my current setup I was messing around with a voltmeter, and with the fan running on HIGH getting power through the blue wire, I am reading 16 volts coming through the unused LOW (brown wire) side. If I switch it around so that the LOW wire is getting power, I am getting 8.5 volts coming through the HIGH side.

I dont know much about electric fans, but this does not seem right to me. Is this situation normal? Thanks for the help, and reading all of that.

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post #2 of 6 Old 06-05-2010, 09:19 AM
Djsthe1
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I'm not sure about the back feed or even the color of wires, it has been awhile since i installed mine. I don't know if it helps any but this is basically how I ran mine but without the diode and I added a few more LEDs to show when the fan is on. Hope it helps you out..
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post #3 of 6 Old 06-05-2010, 11:31 AM Thread Starter
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Thanks for the reply.
Is their supposed to be a picture or a link? I don't see anything.
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post #4 of 6 Old 06-05-2010, 12:01 PM
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post #5 of 6 Old 06-05-2010, 12:46 PM
djsmith1174
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Due to the fan being an electric motor, you are going to get feedback current in the unused armature of the two speed fan. I would not be surprised if you saw 8 and 16 volts on the opposing circuit due to the variations in speed. I installed a rectifier in my low speed circuit to try and minimize feedback current, but I still have enough coming through to trip a relay.

I know this because I initially wired my low fan on LED to the + side of the circuit. My LED would turn on when the fan was being turned by air moving the fan at speed. Even though power to the fan was off. I rewired the relay to work off the fan relay ground and it now works as intended. Hope this helps.
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post #6 of 6 Old 06-05-2010, 03:34 PM Thread Starter
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Quote:
Originally Posted by djsmith1174 View Post
Due to the fan being an electric motor, you are going to get feedback current in the unused armature of the two speed fan. I would not be surprised if you saw 8 and 16 volts on the opposing circuit due to the variations in speed. I installed a rectifier in my low speed circuit to try and minimize feedback current, but I still have enough coming through to trip a relay.
Where did you place the diode when you added one? Same place as the post above?

I found this image elsewhere on the internet, ignoring everything else, do the placement of the two diodes on the right look correct?



EDIT: I see now that both this schematic, and the schematic posted previously have diodes in the same place. This just has one added on the HIGH side.

I dont understand how placing a diode there will help. In that position wont it just stop current from reaching ground? Maybe someone can clear this up for me.

Last edited by socko; 06-05-2010 at 05:43 PM.
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