At 11:40 PM 9/10/2009, Scott Daniel  - Turbovans wrote:
>Here's an electrical question for ya David.
>When fitting a heated oxygen sensor to a vanagon that had just a
>non-heated single wire one,
>what is the proper place to connect the heater wire to ? - the wire
>that will power the heating element in the sensor.

My first thought would be to check the draw of the vent hose heater
and the sensor, and if they'd both fit comfortably into five amps
then power it off that.  It's handy in the connection box and it's
fused (as is the rest of my nice "Approved by Scott Daniel" harness
now, as well).  :-)

Next one I'd think of though would be off the ECU power.

I wouldn't *expect* any problem from connecting to the coil B+, but
conceivably getting the wire too close to the HV stuff might capture
some noise that could perhaps upset the sensor.

:-)
d