Pulling my hair out and i dont have much

[Elliot]

Today thought i would tackle an inoperative windscreen washer pump on a 1984 944.

Checked pump on another car and worked fine
Checked connector and on pull of lever 12 volts reading

put pump back - no go

surely with 12 volts the pump should run?

maybe an earth issue - need to check tomorrow

anybody had this problem?

cheers

 

[Hairyarse]

I take it the pump's making no noise?

 

[vitesse]

Have you connected the pump directly to say a battery charger? Could it be the one way valves?

 

[bmnelsc]

From your description - it sounds like a grounding problem. If the pump is running with no fluid appearing, then its likely clogged lines or nozzles......

 

[JamesO]

If you can, make up an extra pair of wires and crimps so you can leave a meter connected when you operate the pump, you can then see if the 12v drops under load.

 

[Elliot]

cheers chaps

pump is not making a noise on the car but does run on another so i know its not the pump.

have removed bonnet jet pipes and one way valves and cleaned and the valve in the bottle so i know its not them so as you say it has to be a grounding problem.

will have another go and report back.

cheers

 

[Hilux]

ORIGINAL: Elliot

cheers chaps

pump is not making a noise on the car but does run on another so i know its not the pump.

have removed bonnet jet pipes and one way valves and cleaned and the valve in the bottle so i know its not them so as you say it has to be a grounding problem.

will have another go and report back.

cheers

If the pump runs on another car it should on yours

Check you have 12 volts to it on the car and earth it with a bit of wire or.............remove it and hard wire it to positive on battery and earth to battery

If its the earth you could trace the earth or simply cut it and wire in another and ground it on the car somewhere

 

[tref]

This is a problem I am very familar with on 944s... and it is nothing more than a dodgy connection somewhere. If the component isn't connected, you get a reading of 12v at the terminals. Try operating said component, and the voltage across the terminals will likely read only a few volts, if that. It doesn't necessarily mean it is an earth, it could be any one of the connections on the washer motor circuit - switch or fusesbox I would suggest most likely after the connectors to the pump itself.