Changed 3 of the little buggers on the same car now, and the low water warning light is STILL ON on the dash

Anyone got any ideas ??

 

Whats the light doing?

Flashing for 30 secs after turning the ignition on or just constantly illuminated?

 

Constantly on matey !

 

Was hoping you weren't going to say that.

If you've put 3 different switches in it can only be the ECU. Were they all new?

If there was fault on the circuit it would flash.

The ECU's are a bit shit to be honest

 

No all second hand mate, could it not be a broken wire ?

 

you wish

If theres a fault on the circuit the bulb flashes when you initially switch on to tell you the circuit has a fault.

The switch changes between 2 resistances, if the ECU doesn't see either resistance it knows there is a fault.

Have you got a multi meter? And without being rude, presumably you have topped the level up yes?

 

Yes mate got a multimeter and yes i have topped up the level lol

What you thinking next ?

 

Put the meter across the switch, and move the float up and down, you should see the resistance change from about 1500 ohms (float down) to 300 ohms (float up).

If the switch tests out ok you'll probably need to change the ECU.

 

The ECU as in the whole car ecu ? Or the yellow box ecu ?

Wheres the Yellow aux warning ecu located ? I actually have a spare one of these.

 

The yellow box

But they can also be blue, black, green etc lol

Take the centre grille out of the dash, its below that. 2 x 10mm nuts, and they usually need prying off and they stick to the sound deadening on the bulk head.

 

Likely to just be fooked or can i test it ?

 

Just change it mate