The part # is 056-903-291. Note that Westy's also have a second
condenser connected the blue wire for the warning light rotor activation
circuit. Thos condenser is the absorb the voltage spike from the
refrigerator or dual battery relay connected to this circuit.

The O2 sensor voltage should be measured from the black wire to ground.
When the sensor is cold, you shuld see about .5 volt. This is the
leakage voltage from the ECU input circuit. When the sensor is warm and
working, the voltage will vary from .2 to .8.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Shawn Wright
Sent: Sunday, April 13, 2003 11:52 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Condensor for 90A alternator

Yesterday I installed a capacitor across the alternator terminals, using
the
same size I had installed in the AFM a few years ago (22microfarad, 25V
electrolytic). I haven't installed a new ground yet, nor driven it, so
can't say
if any change is apparent. The idle still has the odd miss, so I doubt
it has
made any difference.

Two questions:
Bentley shows a nice stock condensor for the 90A alternator, but of
course
this is missing on mine. I'm worried the thin conductors on the
capacitor
will not stand up, so I'd rather get this condensor if I can find it.
Any ideas
where to get one?

The two wire connector for the O2 sensor appears to have two "probe
contacts" to allow for checking when the circuit is connected. I stuck
my
digital VM in these and registered a very low voltage at idle, engine
cold.
(something like 0.02V ). Does anyone have the correct range of values
for
the O2 sensor? Bentley suggests the only way to test is with a CO meter.
Since my mileage is ok at about 12liters/100km, or 23 mpg imperial /
20mpg US, I suspect it is functioning somewhat. (mileage for mixed
driving, highway should be better).

Shawn Wright
http://Zuiko.sls.bc.ca/swright
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