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 Posted: Fri Oct 1st, 2021 09:52 pm
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Steve Trupiano
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Hello, I am trying to restore an Emerson 71666 fan that has been in the family since it was new. The fan is in decent shape, but it had to AC cord and the wires from the motor to the switch had been cut so I am not sure on what wire goes where. I have looked at several diagrams on-line but most don't apply to the 71666. I have installed new head wires, but need some guidance on which wire goes to what on the switch. I have attached a diagram of my wires along with the ohms readings. Any help would sincerely be appreciated.

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 Posted: Sat Oct 2nd, 2021 12:59 am
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David Hoatson
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One AC wire (it doesnt matter which, but neutral is a little safer in case the plastic handle on the switch lever cracks off) goes to the terminal that connects to the switch wiper arm. 
The other AC wire goes to the motor via a screw on the switch plate that has no other connection. Label this “A”.

The single wire from the coil goes to the motor. Label this “B”.

Another motor wire connects to the switch on the rightmost switch terminal 3. Label this terminal “C”.

Label the three motor wires “1”, “2”, and “3”.

Connect the three motor wires to the three terminals. Try the six different possibilities. Take notes of if it started and what direction, CW or CCW. 

The 6 combinations:

1A, 2B, 3C
1A, 3B, 2C
2A, 1B, 3C
2A, 3B, 1C
3A, 1B, 2C
3A, 2B, 1C

Leave the switch on position 1.

For each combination: connect the wires (I use tape), plug in the fan, note if it started and what direction, and unplug the fan. 

Only plug the fan in for a couple seconds. 

Swap wires to another combination, and repeat the test. 

You will only find one or two combinations that start the fan in the correct direction. 

If there is only one combination, you are done. Make the connections permanent. 

If two combinations work, test how well it starts, look at the different speeds, and how fast high is. Pick the best one. 

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 Posted: Sat Oct 2nd, 2021 01:09 am
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Steve Trupiano
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Thank you! I’ll give that a try.

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 Posted: Sat Oct 2nd, 2021 01:22 pm
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Tom Newcity
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This will work.  The 71666 connects the same as the 29646.


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 Posted: Sat Oct 2nd, 2021 05:11 pm
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Steve Trupiano
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Thank you !

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 Posted: Sat Oct 2nd, 2021 06:14 pm
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Jim Kovar
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David Hoatson wrote: One AC wire (it doesnt matter which, but neutral is a little safer in case the plastic handle on the switch lever cracks off) goes to the terminal that connects to the switch wiper arm. 
The other AC wire goes to the motor...

Neutral to the switch
is a good idea,...
                       this time.

But usually...



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 Posted: Sat Oct 2nd, 2021 09:24 pm
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Malcolm MacGregor
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Jim has a very good electrical point in my opinion. Keeping aware of the neutral wire verses the hot wire is important. It may not change the operation, but it is better wiring. I mark all my resto plugs to reflect which is the neutral ( white wire).

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