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My 2 cents:<br>
<br>
I think tapping into wires (variant 2 / footwell panel) isn't
something we should suggest / encourage users to do.<br>
<br>
A regular user is perfectly capable of unmounting the passenger seat
and plugging in prefabricated connectors. That also is easily
reversible, and using the original antennas for the OVMS is really
neat as well.<br>
<br>
So I'd vote for variant 1 (combined with OBD), with a long cable to
mount the OVMS module in the front left near the OBD connector (i.e.
not replacing the OCU under the passenger seat), and the kit for
that could/should include the Fakra antenna plug/adapter with
antenna cables of the appropriate length to connect to the module in
the front.<br>
<br>
@Mark: for clarification, this image shows a very short T26
connection meant to place the OVMS under the passenger seat near the
T26 connector, replacing the OCU:<br>
<br>
<img
src="https://docs.openvehicles.com/en/latest/_images/DSC00373_1024.JPG"
width="477" height="267"><br>
<br>
This does not apply when mounting the module in the front near the
OBD port.<br>
<br>
Taking +12V from the OBD port, the T26 connection cable then only
needs to connect GND and CAN-L, CAN-H of the T26 connector:<br>
<br>
<img
src="https://docs.openvehicles.com/en/latest/_images/T26a-Pins.jpg"
width="483" height="341"><br>
<br>
This image shows the vehicle side of the T26 connector, i.e. the
OVMS cable needs to be plugged into that.<br>
<br>
It would be nice if the OVMS plug could also be secured by using the
white lock lever shown, that's what Chris intends by using some
original T26 part for this. Maybe there are compatible connectors
available, but other ways to secure the connection would also be OK.<br>
<br>
Can't help with the cable lengths needed for a proper installation,
I still haven't done that connection other than by a flying CAT5
cable for re-engineering…<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 26.11.25 um 08:15 schrieb Chris van
der Meijden via OvmsDev:<br>
</div>
<blockquote type="cite"
cite="mid:80b45a01283ee435cb54ee99ee3b518d260009f5.camel@arachnon.de">
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<div>Hi Mark,</div>
<div><br>
</div>
<div>as I started the e-Up OVMS project years ago my first
approach was the T26 cable. The reason for that more complicated
cable was that with the direct connection to CAN3, I was able to
get write access for i.e. climate control.</div>
<div><br>
</div>
<div>My way to do so was replacing the VW TCU under the passenger
seat and connect to the VW T26 connector there (hence the name
T26). </div>
<div><br>
</div>
<div>As the project developed the direct ODB access was added by
other very capable developers to gain more data from the car. So
we ended up with 4 cables. T26 alone, ODB alone, ODB + T26 under
the passenger seat, ODB + T26 at the passenger footwell panel.</div>
<div><br>
</div>
<div>T26 alone and ODB alone have only historical value, so there
needs to be a decission, if you want to make the hybrid cable
for under the passenger seat or at the passenger footwell panel.</div>
<div><br>
</div>
<div>The advantage of the "under the seat" cable is, that you can
use the GPS and GSM antenna of the car. Disavantage is, the you
have to struggle with the seat. The "footwell" cable is much
easier to install, but OVMS will need extra antennas for GPS and
GSM.</div>
<div><br>
</div>
<div>I would suggest, that the decission about what cable to make
should be discussed here briefly first.</div>
<div><br>
</div>
<div>Then someone will probably be able to provide the length of
the cable.</div>
<div><br>
</div>
<div>Information on the connector, wire type and pinouts are in
the documentation. The connector is a workaround as we were not
able to find the original female T26 plug. But perhaps things
has changed and somebody has more information on that now.</div>
<div><br>
</div>
<div>Hope this is of some help.</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Chris </div>
<div><br>
</div>
<div>Am Mittwoch, dem 26.11.2025 um 10:49 +0800 schrieb Mark
Webb-Johnson via OvmsDev:</div>
<blockquote type="cite"
style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex">
<div>We’ve had some enquiries regarding making a standard OVMS
cable T26 for VW eUP, Skoda E IV, and Seat MII electric.</div>
<div><br>
</div>
<div>From my understanding, the cable is variant 1 described
here:</div>
<div><br>
</div>
<div><a
href="https://docs.openvehicles.com/en/latest/components/vehicle_vweup/docs/index.html"
moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.openvehicles.com/en/latest/components/vehicle_vweup/docs/index.html</a><br>
</div>
<div><a
href="https://docs.openvehicles.com/en/latest/components/vehicle_vweup/docs/index_t26.html"
moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.openvehicles.com/en/latest/components/vehicle_vweup/docs/index_t26.html</a></div>
<div><br>
</div>
<div>If there anybody here knowledgeable about this, that could
help specify the cable exactly? Things like:</div>
<div><br>
</div>
<div>
<ol class="MailOutline">
<li>Exact T26 connector</li>
<li>Length of each cable segment</li>
<li>Cable wire type</li>
<li>Pinouts</li>
</ol>
<div><br>
</div>
</div>
<div>Preferable somebody who has already done it and can
document exactly what they have.</div>
<div><br>
</div>
<div>Also presumably this requires unplugging the existing OCU,
and what is the impact of that?</div>
<div><br>
</div>
<div>Regards, Mark.</div>
<div><br>
</div>
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</div>
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</blockquote>
<div><br>
</div>
<div><span></span></div>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
Fon 02330 9104094 * Handy 0176 20698926</pre>
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