There are 2 main ground location on any westy.
Here is the first one:
http://www.benplace.com/85rouge/rouge154.jpg
(just under the coil / on fire wall)
This one is hooked to the left head on engine, on engine, at least 5 wires
are attach to this one (mostly on the earlier version), the second one in
the engine area is on the tranny, in front of this one (a safety one).

Another dificult to reach location is in the dash! left side, behind the
fuse box, about 12 ground over there, mostly for dash use. Half of dash
problem are related to bad ground, including the radiator fan, it's hooked
over there, also the heater blower is there.

Now, how is your + doing? especially on the starter!

That is about it!

Ben

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Possibly the most common recommendation to track electrical gremlins is
"clean your grounds." My questions: is there a good list of ALL of the
ground locations on the 2.1? How many are there? Where? Are they all braided
metal lines i.e. no insulation?