Lotus Elan

Wiring of window motors

PostPost by: oldelanman » Wed Aug 06, 2008 5:06 pm

I too have noticed those markings on the casing but I am sure in this application they are irrelevant. Don't forget that this is a Ford wiper motor "borrowed" by Lotus as a window motor. The casing has no effect on the operation of the motor it contains only the field magnets and no electrical connections. Since the polarity of the motor is reversed to achieve raise/lower functions it does not matter if the vehicle is pos or neg earth.[/code]
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PostPost by: umbyfer » Sun Apr 04, 2010 9:04 pm

Hello,

I don't understand the function of the black wire.
Also my motors on a elan sprint 1971 are with 4 wires: 2 green connected toghether going to the green-red, one green-brown going to green brown and black not contected to anything...why?

Can I remove the black? or I have to connect to the ground somewhere?

Why the wire is different from the wire diagram?

thank you,

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PostPost by: Frank Howard » Mon Apr 05, 2010 1:21 am

Umberto,

Unless you're planning on someday using your window motors for their intended purpose which was as wiper motors, you can add lightness by removing the black wire as well as the green wire that goes into the gearbox.
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PostPost by: umbyfer » Mon Apr 05, 2010 9:53 am

Thank you to Frank for the explanation; so, after all the info from this topic it is possuble to arrive at the following conclusion:

the official wiring diagram is wrong comparing to the reality, where all the window motor are with 4 cable instead of three and working in different wire connection.

Is it correct?

Ciao,
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PostPost by: Frank Howard » Mon Apr 05, 2010 3:09 pm

Umberto,

The official wiring that I can see shows 3 wires to the motors, not 4. It doesn't show the extra green wire that goes to the gearbox because it is unnecessary unless you're using the motor to power your wipers. Of the 3 wires shown, the diagram shows the black going to ground at the courtesy switch otherwise known as the door switch. This black wire is unnecessary as well. While the brown/green from the motor plugs into brown/green in the harness, the green from the motor plugs into brown/red in the harness. I can only guess that Lotus selected brown/red for the harness rather than green because they were already using green to power several components including the windows and using the same color for the momentary connection between the switch and the motor would have been even more confusing. Are you confused enough?
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PostPost by: dlbarnes1 » Tue Apr 06, 2010 12:19 am

Ditto on what Frank says about the wiring diagram and connections at the motor.
I would add that if the window direction (up/down) does not correspond with the switch direction, reverse the connections at the motor; brown/green (motor) to brown/red and green (motor) to brown/green.

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PostPost by: Frank Howard » Tue Apr 06, 2010 12:44 am

Or flip the switch over.
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PostPost by: Galwaylotus » Tue Apr 20, 2010 9:15 am

. . . or brown and black! As the dc motor works in either direction depending on polarity, reversing any two pairs will reverse the switch operation. 8)

I still have my problem of the motors only working in one direction. I think it myst be a switch problem. Anyone know where I can get new switches to the same spec as the originals? :?
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PostPost by: smo17003 » Thu Apr 22, 2010 1:18 pm

With powered windows being standard fit on most modern cars for the past 20 odd years, has anyone out there had a go at replacing the motor/cable system with something a bit more modern (and reliable)? Some of the latest do look very light in weight in comparison to the OE motor; so could possibly save a few valuable ounces.

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PostPost by: Frank Howard » Thu Apr 22, 2010 1:34 pm

Mike,

I have. The modern electric window mechanisms include motors that are much smaller and much more powerful. They are so narrow that the entire mechanism can be dropped into the window slot with the motor attached. The Elan employs a wiper motor that is much wider however unlike the modern motors, it can be seperated from the mechanism while it is being dropped into the window slot and then attached after it is in position.
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PostPost by: smo17003 » Thu Apr 22, 2010 2:18 pm

Frank,

Any pictures or donor vehicle details available?
My doors are completely stripped down at the moment so now is the ideal time to have a go. I'm really keen to have a go at this one because a) there are so many horror stories of broken glass and b) the cost of a bit of wire and a few nylon pulleys is probably more than the cost of a conversion. :?
I suppose there's also a c) someone will buy my redundant motors off Ebay :roll:

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PostPost by: Frank Howard » Thu Apr 22, 2010 2:26 pm

Mike,

There are no donor vehicles because a modern motor cannot be attached to it's mechanism after it is installed in the door.
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PostPost by: billwill » Fri Apr 23, 2010 12:55 am

A thought about window lifters just hit me.

It could be lots more compact to use a small hydraulic ram to lift the window, with a small pump and reservoir under the bonnet to feed both sides.

I wonder what is available in that line.
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