xenon headlights acting like strobe lights

[rich599]

can anyone advise me what to do. i have a 51 plate ML270 cdi and the xenon headlights work perfectly on ignition but with the engine running they turn into strobe lights!!!

 

[Xtractorfan]

Once they are lit up and auto adjusted they should remain so. what exactly are they doing.. still auto setting themselves. I would check that the motor is switching off when the lighs have set themselves

 

[television]

If the are strobing the power supply to the lights must be scoped, I cant think of any other way

 

[Richard Moakes]

Diode gone in the rectifier pack of the alternator?

Sounds like the main car voltage is swinging around, needs a scope or a dvm with bargraph to see it happening and confirm a diagnosis.

 

[rich599]

thanks for the replys,i will have the alternator checked out ,

 

[rich599]

Today i have been trying to sort this,first i took the power lead off the altenator then started the engine and they stopped strobing,so me thinks that it is the alternator,until i put jump leads from my 07 sprinter van to the ml battery then started the van and the lights started stobing again,so now i am confused again, anyone got any ideas ?

 

[television]

I will have a look tonight to see if anything is listed

 

[rich599]

I have today finally got them sorted,it turns out that the car originaly came with ordinary lights,but the person that i bought the car from had replaced them with xenon lights,but to make them work the car has to go on a star diagnostics and have the ecu programed to having xenon lights fitted, so it has just cost £68 to get them fixed,which i am really happy about cos now i can stop pulling my hair out

 

[television]

Thank you Rich for posting back,, we could have never guessed that one