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Thread: Series III Blower Motor

  1. #1
    Join Date
    Mar 2015
    Location
    Groton, Massachusetts
    Posts
    19

    Default Series III Blower Motor

    Hi, all!
    This is my first post on here and it is regarding the blower motor on my Series III. I tested the electrical connection and everything is A-OK. But still the motor doesn't run, and I'm wondering if it is possible to repair or if I just need to replace it entirely. If it is repairable, please let me know how!
    Thanks!

    Here is the blower:Click image for larger version. 

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  2. #2
    Join Date
    May 2014
    Location
    Marblehead, MA
    Posts
    383

    Default

    That's a two speed blower. The way it works is that the Green/Yellow wire runs power through a coil resistor (you can see it inside the blower) and then to the brown line supplying power to the motor. The green/brown wire is a direct tie into the brown line - which (as mentioned) runs power to the blower. The green/brown and green/yellow wires run to a three position switch (off, low, high) that runs power through one of the two wires to the blower.

    With the switch to high, the green/brown wire is the source of power and bypasses the resistor, giving full power directly to the blower. With the switch on low, the green/yellow wire is the source of power and it runs through the resistor, giving partial power to the blower.

    Points of failure on these blowers are with the resistor (you can only get high power) and with the motor itself. You can test the motor with a 12V battery. Ground the black wire to the battery's negative terminal. Briefly touch the green/brown wire to the battery's positive terminal. You should get high speed. If you get no rotation, the motor needs repair. Briefly touch the green/yellow wire to the battery's positive terminal. You should get a slower speed. If you get no rotation, the resistor needs to be replaced.

    Good blog on repairing these motors here.

    Post some pictures of your truck! And, welcome to the forum!!
    1968 Series IIa
    1997 Defender SW (Original Owner - Sold)

  3. #3
    Join Date
    Mar 2015
    Location
    Groton, Massachusetts
    Posts
    19

    Default

    Thanks a ton for this; it is very helpful! When I go home this weekend, I will try to resolve the issue and I will let you know how it went. I'll also be sure to upload some photos of the beast!

  4. #4
    Join Date
    May 2014
    Location
    Marblehead, MA
    Posts
    383

    Default

    Awesome - looking forward to hearing about it. You're in the right place ;-)
    1968 Series IIa
    1997 Defender SW (Original Owner - Sold)

  5. #5
    Join Date
    Oct 2006
    Posts
    1,199

    Default

    If it is dead, moss motors has them:
    http://www.mossmotors.com/Shop/ViewP...SortOrder=40#3

  6. #6
    Join Date
    Mar 2015
    Location
    Groton, Massachusetts
    Posts
    19

    Default

    @o2batsea Thanks for the link, but I think I'll try fixing it before shelling out 90 bucks.

  7. #7

    Default

    These are a standard Lucas blower motor, used in Triumphs, MGs and most other Brit vehicles of the same age, shouldnt be too hard to source on from either the internet or through swap meets. Good hunting!!!

    Bruce

  8. #8
    Join Date
    Mar 2015
    Location
    Groton, Massachusetts
    Posts
    19

    Default

    Any idea if I could purchase just the squirrel cage alone, or does it have to come with the entire motor?

  9. #9
    Join Date
    May 2006
    Posts
    2,020

    Default

    RN has this in stock. Metal one so it wont explode like the plastic ones do.

    http://www.roversnorth.com/ProductDe...e=0&eq=&key=it
    Les Parker
    Tech. Support and Parts Specialist
    Rovers North Inc.

  10. #10
    Join Date
    May 2006
    Posts
    2,020

    Default

    Les Parker
    Tech. Support and Parts Specialist
    Rovers North Inc.

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