neil:
   You sure can develop some interesting problems.
It seems very unlikely that heat could cause a relay to stay on when there
is no current thru its coil.  If you completely understand the circuitry,
you should be able to troubleshoot this with a meter.  If there is power to
the ignition coil when the key is off, trace it back to its source.  If the
relay is staying on, there must be a reason why power is applied to its
coil.

Larry A.

On Mon, Jun 23, 2008 at 1:23 PM, neil N <musomuso@gmail.com> wrote:

> Hi all.
>
> Just took my VanaJetta for a real test run. Runs much better now!
>
> Ignition switch is fairly new, worked fine before conversion, and if
> "new" engine cold-warmish, works fine.
>
> When engine hotter after short hwy. run, it won't shut off.
>
> I put in a separate relay to supply power to Jetta ignition coil.
>
> I suspect heat as the culprit.
>
> If a relay gets too warm-hot, would this cause it to stay "on"?
>
> Here's a pic of relay box/exhaust:
>
> http://tubaneil.googlepages.com/exhaust.jpg/exhaust-full;init:.jpg
>
> Maybe relay box is too close to exhaust or exhaust too exposed.
>
> Would a heat shield on exhaust or relay box help that much?
>
>
> Thanks,
>
> Neil.
>
>
>
> --
> Neil Nicholson '81 JettaWesty "Jaco
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
> http://web.mac.com/tubaneil
> http://tubaneil.googlepages.com/
>