Well the pump works fine, so it must be something else.  I connected the pump to the battery directly and it runs.  BTW, the other wire is for a valve; it clicks when you give it power like it is supposed to.  And the pump runs when you connect brown and green to battery.  The puzzling thing is that I get 12.x volts at the plug on the same connectors that I connected straight to the battery, but at the plug it won't run.  I even cut the plug and connected directly to the wires to be sure I was getting a good connection.  I don't know how it can show 12.x volts at the plug but not have enough power to run the pump.  I am not that good at using my multimeter but maybe there is a way to diagnose further. Maybe something is loose enough that it shows it has power, but it isn't able to give any current?  I did set the multimeter to 10A and tried to see what the pump was drawing, but with the pump not running, I don't know if the value I got has any meaning
 .05amps.  If no one has any suggestions, I will be headed to the shop. 
Thanks
Dave

-- On Fri, 12/24/10, David Vickery <david_vickery@YAHOO.COM> wrote:

> From: David Vickery <david_vickery@YAHOO.COM>
> Subject: 87 Cruise Control troubleshooting
> To: vanagon@GERRY.VANAGON.COM
> Date: Friday, December 24, 2010, 5:07 PM
> Hi all,
> 
> Hoping someone can help with my 1987 stock cruise control
> problem.
> 
> Background:� My cruise was working well now it won't
> come on.� I went through the Bentley troubleshooting
> diagram with a test light and passed the first several
> checks, including the tests for the clutch and brake
> switches.� Since I passed those tests, obviously the
> fuse is fine and the on/off button works.� When I got
> to the test for the vacuum pump motor, jumping #4 pin with
> ground it says I should hear the pump come on.� I don't
> hear anything.� With the ignition on and the cruise
> control in the on position, the test light lights up but no
> sounds from the pump in back.
> 
> I tried another pump today (used and unknown condition) and
> I don't hear anything with it either.� So I am
> wondering if it could be a wiring issue or possibly the 2nd
> pump is bad.� With the #4 jumper in place and a volt
> meter at the pump in back, I read 12 volts at the plug using
> + to green wire and negative on the brown wire.� I
> don't know what the green and white wire is for but I don't
> get 12 volts when I try substituting that for the green wire
> with my voltmeter.� When I had the pumps out, I tried
> putting 12 volts to them directly and I don't hear anything,
> but I am not sure if I should be using the green/white or
> green or both with brown going to negative.
> 
> If anyone knows how I can test the pump directly and what
> it should sound like if it is working, I would be very
> appreciative.
> 
> Thanks, Dave
>