Viewing images of other vehicle wiring, it seems some use a relay to
carry power to the coil.

Jetta Motronic 2.9 uses a 0.5mm wire to ECU. Pretty sure it sends + to
ECU so ECU will "turn on" and energize other engine management items.
The '81 Vanagon uses a slightly larger wire to the coil.

Thought: use Vanagon coil wire for  +  to ECU and relay for  +  to the
Jetta coil

mocked up diagram:

https://lh5.googleusercontent.com/-qjVqWgmKgiA/UQLzz0KnCHI/AAAAAAAAGq8/dV79PgDqWQg/s720/ABA%2520swap%2520coil%2520wire%253F.jpg

If I did this, I *think* that when key turned to ign. off,  + to ECU
will be cut off so engine should shut off regardless if a little +
power wants to loop back to 15 via the instrument cluster.

Input welcome!

Neil.

On Thu, Jan 24, 2013 at 9:10 PM, neil n <musomuso@gmail.com> wrote:

> .....  it was
> determined that power from the alternator blue wire was looping back
> into the + side of the relay coil via the 15 wire to the (dash lights?
> No Bentley in front of me) But here's the kicker:
>
> if I pulled the hand brake on, the engine stopped!
>
> Seems the addition of the e-brake light drew enough current to allow
> the relay to open.
>
> This was repeatable but usually only happened when the engine was warm.
>
> Neil.
>
> On Thu, Jan 24, 2013 at 8:43 PM, David Beierl <dbeierl@attglobal.net> wrote:
>> At 11:27 PM 1/24/2013, neil n wrote:

>>> At one point I'd wired in a relay to be triggered by 15 so it would
>>> carry power to the ECU and coil. But then there were times when the
>>> engine wouldn't shut down unless the hand brake was engaged.
>>
>>
>> Uh...why?
>>
>> d
>>
>>
>
>
>
> --
> Neil n
>
> 65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp
>
> '88 Slate Blue Westy to be named.
>
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>
> Vanagon VAG Gas I4/VR Swap Google Group:
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines

--
Neil n

65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp

'88 Slate Blue Westy to be named.

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG Gas I4/VR Swap Google Group:

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines