At 12:34 5/9/2000, jeff crane wrote:
>simply unplug disconnect everything from the circuit  and  start hooking
>things back up.  When you plug in the offensive item and the short is
>reintroduced, the breaker/fuse will open again.  Then you will know what

In this case all the connections are made at once, unless you start pulling
pins out of the switch connector (maybe a good idea).

Actually, the way this circuit is wired, a short to ground in any of the
three motor supply leads would probably blow the fuse in all positions.  A
shorted motor would likely do the same.  I think your options here are
either physical inspection of the system, or using an ammeter with a
current-limiting resistor (or else an ohmmeter that can measure well below
an ohm, not all that common) to see which path draws the most current, then
use the schematic to analyze the results.  A one-ohm resistor would limit
the current to about 12 amps max; a two-ohm resistor would bring it into
the 10-amp range of common electronic multimeters, and would let you squeak
by with a 5-watt resistor, although 10 would be better.  Circuit looks like
this:

Wh (low)________________v^v^v^---v^v^v^____(Y)___________Motor___Gnd
Y/Bk (med)____________________|                                              |
Y (high)______________________________________________|

david
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"