Hello Listees:
My '85 Vanagon failed the state safety inspection, because the
right rear turn signal bulb is not as bright as it should be (or at
least compared to the left rear).  It seems to flash bright enough
when the running/head lights are off, but dims noticeably when the
running lights are turned on (and the inspector insists that all
lights be left on!).  Both left and right rear bulbs seem to be
equally bright when the emergency flashers are switched on.

Questions--
I'm trying to track down the various related wiring connectors.
The Bentley schematic shows a connector "T4a", but doesn't list
where it is.  It does list T4 and T4b, so are T4 and T4a the same
thing?

Why would turning on the running lights affect one rear turn
signal, and not the other?

The right rear lamps (brake, turn, and running) seem to share a
common ground, but I don't think that is the problem, otherwise all
the right rear lamps would be dimmer than the left side, correct?

My multimeter is too slow to read the voltage to the RR turn signal
bulb, when the flashers are operating.  So is my only other option
to ohm out the wiring to that bulb, and compare to the left side?

Any other *specific* troubleshooting ideas would be greatly
appreciated.  My e-mail currently isn't working (message to it will
bounce), but I will read responses on the Vanagon.com archives.
Thanks in advance!

Cary