sharkey964

Active Member

• Apr 13, 2017

• #1

Hello lads & lasses

I have a bizzar problem with the headlight ON light on the dash.It stays on all the time,wether the lights are on or not.Not causing any other problems,except bugging me.
Can anyone give any ideas where to start looking?
Cheers
Marc

 

neilly

Well-Known Member

• Apr 13, 2017

• #2

Hi Sharkey,

May help if you say what Year it is.
Have you got the Rave electrical diagrams?

Cheers

 

sharkey964

Active Member

• Apr 13, 2017

• #3

Oooops,should have said,Its a 300tdi.

 

neilly

Well-Known Member

• Apr 13, 2017

• #4

Page 20 of the Rave workshop manual electrical diagrams should help you find out where the dodgy live is coming from.

Cheers

 

sharkey964

Active Member

• Apr 13, 2017

• #5

Thanks for your quick reply Neily
An electrical drawing is no good to me,might as well be chinese.
Marc

 

brian47

Well-Known Member

• Apr 13, 2017

• #6

From what I can see, the "main beam" warning light is fed from the circuit to the high beam headlights more or less directly from the stalk switch.
The only way for the light to come on as a fault would be either the feed to the light has become diverted to another circuit or, more likely a problem with the earthing on the one of the headlight units providing a "ghost" 12 volts back to the warning light. Sounds a bit odd, I know but with common chassis working such as that found in vehicles, all sorts of strange things can happen due to bad earths.
It's unlikely that any difference in light intensity would be noticeable, but it's not unheard of.
Check the earths carefully.
On the two drawings, it's the blue/white wire to the point "F" you're interested in.

 

Last edited: Apr 13, 2017

sharkey964

Active Member

• Apr 13, 2017

• #7

Thanks Brian
Do you know where the lights are earthed?
Marc

 

Kwakerman

Well-Known Member

• Apr 13, 2017

• #8

brian47 said:

From what I can see, the "main beam" warning light is fed from the circuit to the high beam headlights more or less directly from the stalk switch.
The only way for the light to come on as a fault would be either the feed to the light has become diverted to another circuit or, more likely a problem with the earthing on the one of the headlight units providing a "ghost" 12 volts back to the warning light. Sounds a bit odd, I know but with common chassis working such as that found in vehicles, all sorts of strange things can happen due to bad earths.
It's unlikely that any difference in light intensity would be noticeable, but it's not unheard of.
Check the earths carefully.
On the two drawings, it's the blue/white wire to the point "F" you're interested in.

View attachment 121332
View attachment 121333

Click to expand...

I think he is talking about the green 'lights on' warning light rather than the high beam warning (Blue)? Sharkey, Blue or Green?

 

sharkey964

Active Member

• Apr 13, 2017

• #9

You got it kwakerman....
Green light.

 

Kwakerman

Well-Known Member

• Apr 13, 2017

• #10

Are you sure there is absolutely no light in any of your sidelights with everything switched off (not even a very faint glimmer in the dark)? The warning light is connected in parallel with the sidelights so if it is on then they should be on at the same time. If you do have a glow I would suspect the dim-dip relay (prone to faults at 20 years age), If you have no glow then I would look in the instrument binnacle to check the warning light connectors are full pushed on to the light cluster, After that its time for a meter (or try and swap the warning light cluster if one is readily available).

 

Gmacz

Well-Known Member

• Apr 13, 2017

• #11

I had this problem, connect an earth into the front earth connector and see if it solves the problem, the one with all the black wires.
If spotlights are fitted, check wiring and temp remove and see if this helps.