At 03:30 PM 4/8/2009, Larry Himli wrote:
>I don't have time to order a wiring harness for my 87 Westy.  Going to haul
>small trailer on this adventure.  Any help with how and where to splice in a
>4 wire connector.  Thanks

You have to get (or build, if you're a die-hard -- it's just four
biggish diodes) a harness with a convertor box that takes the
separate feeds for brake and turn signal and sends them to the
trailer combined; or else put separate turn signals on the trailer
and use a 5-pole connector.

The harnesses are available at any U-Haul that does trailer stuff
(maybe all of them), Advance Auto Parts, NAPA, probably most FLAPS,
and any trailer-specific place.  Cost under $20.  It should come with
3M-type tap splices (actual 3M if you're lucky).

The feeds are accessible near the left tail light, just before where
the harness splits to feed L and R taillights.  It's a loose plastic
sheathing; slit it carefully lengthwise in the middle, far enough to
work with the wires.  Verify correct wires with a pin and test-light
or meter before you splice to them.  If the harness tells you to
ground to the chassis (hence not providing a splice for ground), the
taillight grounds run to a bolt just beneath the ignition coil.

The schematics are on 97.112 ff, tracks 102 and 106 for the running
lights; 121 through 127 for the brake and turn.  The key is on 97.4-5
if you're not used to Bentley schematics.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"