Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (December 2010, week 4)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Tue, 28 Dec 2010 09:37:55 -0800
Reply-To:     David Vickery <david_vickery@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Vickery <david_vickery@YAHOO.COM>
Subject:      Re: 87 Cruise Control--followup
Comments: To: Larry Alofs <lalofs@gmail.com>
In-Reply-To:  <AANLkTimVtm2Tqs-h_LLgf8Wak6pZ33nZ=4cC2xtJQc-u@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1

Thanks Larry, I think you are right that there is some sort of ground or other wiring problem, but I couldn't find it. I followed the Bentley troubleshooting routine which tests ground in the first step (using a test light) and the light came on. All the troubleshooting tests passed initially except the pump. After I got a 2nd used pump and it didn't run, I checked the pumps directly at the battery and they both ran. And with the jumper still in place to run the pump manually, I get 12.x volts at the plug (green +, brown -), and I checked resistance on those wires from the front plug to the back where they plug into the motor. I think it was fine, .08 ohms. Maybe both motors are actually bad and it just takes a direct battery connection for them to get enough juice to run. Or maybe there is a wiring issue elsewhere. I am stumped after 3 days.

I can see how troublehooting electrical issues is difficult on a list. THere are so many mistakes I can make and then give misinformation about what I think I am seeing. I have learned a ton about the cruise control system over the weekend, but still cann't find the problem. I have the van at the shop this morning.

Thanks Dave

--- On Tue, 12/28/10, Larry Alofs <lalofs@gmail.com> wrote:

> From: Larry Alofs <lalofs@gmail.com> > Subject: Re: 87 Cruise Control--followup > To: "David Vickery" <david_vickery@yahoo.com> > Cc: vanagon@gerry.vanagon.com > Date: Tuesday, December 28, 2010, 5:50 AM > Sounds like a ground problem.  > If the ground wire for the pump also > shows 12v, then it isn't connected to a solid ground.  > Do you have a > wiring diagram? > > Larry A. > > > On Sat, Dec 25, 2010 at 5:37 PM, David Vickery <david_vickery@yahoo.com> > wrote: > > 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 > >> > > > > > > > > >


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.