Club 80-90 Forums

ok folks my little red LED flashes constantly i have changed the water level sensor around 3 months ago stopped for a while then back on its defo an earthing problem as when i switch on my lights it goes of i have tried the barrel connector in the engine bay but nothing changing so if it is a bad earth how do i go about rectifying it?? stupid complete novice waiting for reply cheers ROB!!

Have a look behind the dash at the earths and the ribbon cable .

T

its not definitely an earthing problem. I don't have the circuit diagram here to check how it works but that light flashes when it doesn't have 12v on it. You could have a wiring fault that is allowing your lights to supply the 12v. Still worth checking your earths though.

ok remember novice here but doesnt it need a supply of 12v to work? or is thet a silly question
tony tech; what colour is the earth wire that comes out the back of the clocks?? could possibley follow that for breaks etc......
cheers so far

ROBS T25 wrote:ok remember novice here but doesnt it need a supply of 12v to work? or is thet a silly question

not a silly question but I don't have the diagram here for me to give an accurate answer (book is down in the van and I've only just come up so don't want to go down again).

I do know that if the wire on the sensor breaks then the light flashes. In fact the switch on the sensor is a "normally closed" one which mean that the current flows in its rest position. I am guessing that there are 2 circuits. The one that checks for a continuous circuit from the water bottle and one that flashes the light, with some clever electronics sticking the 2 together. Its not just a simple 12v out, through a device and back to earth.

forgot to add, most 0v wires on these are brown although many have been modified, often with black as the 0v wire. A common "earth fault" is the rosette of several wires behind the glove box gets detached and forgotten about (guess how I found out). This leads to very odd behaviour as an earth path is found via other objects. Make sure the rosette is screwed to the bodywork.

cheers for that dave will have a good look next week as we goin to a show today til sun will keep you informed ROB!!