brake lever wiring to cut power - 3 wires... witch one to connect where?

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willywortel
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brake lever wiring to cut power - 3 wires... witch one to connect where?

My Wisper 905se e-bike has three wires coming out from the (left) brake lever switch: red, black and green. I replaced the original v-brake for a hydraulic rim brake and want to attach a micro switch to cut off engine power. If only... I would know where the 3(!) wires are for. (BTW the original switch was not working, so there was not much to measure)
At the moment the wires are hanging loose and the engine is running fine, so standard setting looks like normally open for all three wires.

colin9876
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Re: brake lever wiring to cut power - 3 wires... witch one ...

odd! Are there 3 going into the controller?
Normally its just red / black into the controller - making the circuit cuts the power

willywortel
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Re: brake lever wiring to cut power - 3 wires... witch one ...

Didn't have a look at the controller side yet. Will check that and look what happens if I connect the black and red (ignoring the green)

willywortel
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Re: brake lever wiring to cut power - 3 wires... witch one ...

This is the answer that I got from Wisper Service, Norman:

------------------------------------------------------------------------
The latest 3 wire switches are different to the earlier 2 wire switches.
They are not just simple on off mechanical switches but instead use an
electronic sensor. Hence the red and the black wires are +5volts and 0
volts respectively and the output on the green wire should go from 0 to
approx 5volts when the lever is operated.

You cannot just check the switch resistance with a multimeter like you
would a 2 wire switch and you may in fact damage the electronic sensor by
doing this..

You need to find a way of fitting this original type of switch to your new
lever as a normal microswitch will not be compatible."
------------------------------------------------------------------------

I'm wondering now:
Maybe I could just switch (mechanically) from green attached to black, to green attached to red?
Or is this not logical?

gmouchawar
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Re: brake lever wiring to cut power - 3 wires... witch one ...

Sounds like it is a hall effect sensor on the brake lever.

willywortel
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Re: brake lever wiring to cut power - 3 wires... witch one ...

the bottom line for me is: can I short the wires without blowing anything?

colin9876
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Re: brake lever wiring to cut power - 3 wires... witch one ...

Sounds like you could connect the green to either the black or red as the on off.
Still I wonder why theyve gone to this more complicated arrangement. The previous make contact to break power switching system works fine - and doesnt require 3 leads and more complicated electronics. Whats the advantage of this so called progress?

willywortel
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Re: brake lever wiring to cut power - 3 wires... witch one ...

You're right. I switch now between green-black-closed and green-red-closed. But the result is the same if I ignore the 3rd black wire completely and and make contact between green and red wires to break power.
Thanks for the tips :-). It remains a mystery for me why Wisper chose for their setup.

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