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Head Lights Will Not Turn Off

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22 Jul 2019 14:41 #216561 by SL 300 1986 300 SL 107.041 1986 Standard (Europa)
Head Lights Will Not Turn Off was created by SL 300 1986
Hi,
I have an issue wherby my headlights will not turn on on my SL 300 1986.
So I have to disconnect the battery to actually get the headlights off.
Had the car for 3 years, and it has never happned before.
Is it the light relay?
Many Thanks for any feedback
Rune (Norway)

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  • Marcel
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22 Jul 2019 15:34 #216571 by Marcel 300 SL 107.041 1986 Standard (Europa)
Replied by Marcel on topic Head Lights Will Not Turn Off
Hello Rune,

I think that the lightswitch is the problem. Are you able to switch from the headlight to the parkinglight position?
You you have a daylight circuit?

If you need a wiring diagram for the 300 SL, send a private message with you E-Mail address to me, and I will send the wiring diagram to you.

Gruß Marcel
300 CE-24 Bj 7/90

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22 Jul 2019 15:50 #216574 by Dr-DJet 450 SL 107.044 1973, 450SLC USA 107.024 1972 Schweiz
Replied by Dr-DJet on topic Head Lights Will Not Turn Off
Hi Rune,

well is it just both low beam headlights or also backlights and parking lights?

Power comes from lights switch via combination switch on steering wheel (to flip low beam and high beam) , fuses and a lamp control module to headlights. Lamp control module warns if a light bulb has wrong resistance.

Cable on light switch for head lights normal beam is 56b L (ye-bl) and 56b R. (ye-rd) from fuses 19 and 20 to lamp control module. Marcel can help with a German wiring diagram. So you either have cable contacts ot a shortcut in the two switches or in lamp control module. How to temporarily disconnect? Remove fuses 19 and 20.

Viele Schraubergrüße - best regards, Volker alias Dr-DJet und K-Jet Forscher, Admin und Betreiber dieser Webseite
Alles über D-Jetronic und Zündung auf oldtimer.tips


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23 Jul 2019 09:58 #216662 by SL 300 1986 300 SL 107.041 1986 Standard (Europa)
Replied by SL 300 1986 on topic Head Lights Will Not Turn Off
Thanks Marcel for your answer!

It does not change when I put it in park light position, however when I put the fog lights on, it changes to the park light on headlight as it engages the fog lights.

Also another observation, I disconnected the battery and connected it back, but the lights are still on.

I removed the fuses, 19 and 20, and it was still the light in my panel showing the red battery light. So the batt light is still flashing red after I have fully turn the car off and taken out the key and removed the fuses?

I sent you a message with my email.
I can add that my diamant here is very little used, it has 76K on it and in mint condition, so first time I have any issue with anything.

Rune

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23 Jul 2019 10:02 #216664 by Marcel 300 SL 107.041 1986 Standard (Europa)
Replied by Marcel on topic Head Lights Will Not Turn Off
Hi Rune,

check your E-Mail Box.
I wish you luck in troubleshooting this problem.

Gruß Marcel
300 CE-24 Bj 7/90

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23 Jul 2019 10:18 #216667 by SL 300 1986 300 SL 107.041 1986 Standard (Europa)
Replied by SL 300 1986 on topic Head Lights Will Not Turn Off
Dr D Jet,
Thanks very much for your answer, this support is great.
It is both backlights and the low beam headlights.
When I put on parking or put the switch to `0`, it lights remain the same. Only when I engage the fog lights, it changes.

Fuses, even after taking the fuses out, I will see the red batt lamp light on in my dashboard.

So cable contacts or short cuts in switches. Is this something a Autowerkstatt can help me with or do it require some specialists you think?

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23 Jul 2019 10:35 #216671 by Dr-DJet 450 SL 107.044 1973, 450SLC USA 107.024 1972 Schweiz
Replied by Dr-DJet on topic Head Lights Will Not Turn Off
Hi Rune,

any car elextrician should be able to find that problem. It looks like there is some strange cable contact somewhere. To search that can be time consuming. I would start to pull all fuses until head light turns off. The circuit where the pulled fuse lets the lights turn off would be my candidate to search for the shortcut.

Viele Schraubergrüße - best regards, Volker alias Dr-DJet und K-Jet Forscher, Admin und Betreiber dieser Webseite
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05 Aug 2019 15:41 #218050 by SL 300 1986 300 SL 107.041 1986 Standard (Europa)
Replied by SL 300 1986 on topic Head Lights Will Not Turn Off
Dr D Jet, & Marcel,
Many thanks for your support and guidance during this search.
The car is now repaired.

For the benefit of others, this was the cause of the faulty lights:
The light relee was changed and the headlight issue went away. The workshop used the diagram provided by you during the search.

Subsequent another issue happened and that was the batt light was glowing red while driving. This intitially was thought to also be a part of the headlight issue and some kind of wiring issue.
However this was found to be that the dynamo giving it 19 V, not to the battery, but to the indikator lamp in the dashboard.
Dynamo was changed and it is now all working.

Thanks again this Forum for guidance, much appreciated.

Rune
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