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 |
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