Replacement headlight washer pump wiring backwards in the Bentley
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Replacement headlight washer pump wiring backwards in the Bentley
Replacement headlight washer pumps may require a new style of plug be attached to the car wiring harness. If so, beware that the pump wiring in the Bentley service manual is reversed, and will cause the pump to run very weakly. It will still move fluid, but much less than normal. In case it's different in some Bentley manuals, the wiring which worked for me with a 3B7 955 681 pump is:
+ white/red wire to terminal 2
- brown wire to terminal 1.
This is true for two such pumps, manufactured months apart. (I broke the first pump trying to remove the hose from it so I could troubleshoot the bad performance.) It is also consistent with wiring diagrams for 2004 A4 and A8 models. It's probably also how the original pump was wired -- I should have checked.
If there's any doubt before you install a pump, you can run it with a 9V battery, a couple of jumper wires, and a bowl of water.
On the good side, the Audi crimp & heatshrink splices recommended in the service manual are efficient if you have access to a decent crimping tool and a heat gun. When you heatshrink the insulation, it eventually oozes some kind of sealant around the wire to make the whole splice watertight.
Tom
+ white/red wire to terminal 2
- brown wire to terminal 1.
This is true for two such pumps, manufactured months apart. (I broke the first pump trying to remove the hose from it so I could troubleshoot the bad performance.) It is also consistent with wiring diagrams for 2004 A4 and A8 models. It's probably also how the original pump was wired -- I should have checked.
If there's any doubt before you install a pump, you can run it with a 9V battery, a couple of jumper wires, and a bowl of water.
On the good side, the Audi crimp & heatshrink splices recommended in the service manual are efficient if you have access to a decent crimping tool and a heat gun. When you heatshrink the insulation, it eventually oozes some kind of sealant around the wire to make the whole splice watertight.
Tom
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