ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1964 1/2 - 1965 => Topic started by: 65fastbk on July 31, 2019, 12:55:54 PM

Title: Wiring help, 2 or 3 speed motor
Post by: 65fastbk on July 31, 2019, 12:55:54 PM

Hi I have a May built SJ FB and was looking to get some new harnesses.  Im not sure if I have a 2 or 3 speed heater.  Im unsure about which speed wiper I have, is there a easy way to test.  I have attacked a picture of the wires going to the heater motor.

thx!

Title: Re: Wiring help, 2 or 3 speed motor
Post by: krelboyne on July 31, 2019, 02:05:38 PM

Motors are all the same. Dependent upon your switch and the resistor.

Title: Re: Wiring help, 2 or 3 speed motor
Post by: 65fastbk on July 31, 2019, 02:19:57 PM

Thanks, so I should look inside at the heater box? 

Title: Re: Wiring help, 2 or 3 speed motor
Post by: jwc66k on July 31, 2019, 04:40:59 PM

Quote from: krelboyne on July 31, 2019, 02:05:38 PM

Motors are all the same.

The motor looks the same but is wired differently in the motor. Both have two leads to the main harness. The two speed has two internal windings, one for low speed, one for high speed. The two speed windings are also grounded at the motor. The three speed winding is not grounded at the motor.

Quote from: 65fastbk on July 31, 2019, 12:55:54 PM

I have a May built SJ FB and was looking to get some new harnesses.  Im not sure if I have a 2 or 3 speed heater.  Im unsure about which speed wiper I have, is there a easy way to test.  I have attacked a picture of the wires going to the heater motor.

The switch is different as well. Two speed switch is: low; off; high. The three speed is: off; low; medium; high. The heater box for a three speed has a resistor mounted very visible from under the RH dash, the two speed has no resistor.
I strongly suggest you get a set of Mustang Assembly Manuals for your 65 car. You will also need a 64-65 Chassis and a 64-65 Weld and Sealant to be complete.
Jim
Jim

Title: Re: Wiring help, 2 or 3 speed motor
Post by: 65fastbk on July 31, 2019, 04:58:18 PM

Thank you I will take a look at the switch and heater box inside the car.  What should I look for regarding the wiper wiring?

Thx

Title: Re: Wiring help, 2 or 3 speed motor
Post by: jwc66k on July 31, 2019, 06:27:05 PM

Quote from: 65fastbk on July 31, 2019, 04:58:18 PM

Thank you I will take a look at the switch and heater box inside the car.  What should I look for regarding the wiper wiring?

Back to the switch: a single speed wiper is one "click", a two speed wiper is two "clicks". A pull on either switch is the washer.
A May 65 Fastback looks like this.
Jim

Title: Re: Wiring help, 2 or 3 speed motor
Post by: 65fastbk on July 31, 2019, 06:38:03 PM

Thanks Jim,

I confirmed the heater is a 3 speed and washer is 1 speed, thanks for your help!