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Overload relay for 380SL 1983 Australian delivery

  • *ClassiCars!
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14 Oct 2020 13:29 #260010 by *ClassiCars! 380 SL 107.045 1983, 450 SL 107.044 1974 Australien
I have issues with identifying and testing the overload relay, all info referring to a red and fused relay. The type I believe is in my car has only 5 pins with electronics. Model Sidler 000 821 3047. Would like some info on how to test the electronic relay.
Cheers

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  • Dr-DJet
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14 Oct 2020 13:53 #260015 by Dr-DJet 450 SL 107.044 1973 Schweiz
Hi UNKNOWN,

would be great if you could sign with your first name as we like to greet each other.

Let me ask you whether Australia in 1984 already had the US version of cars with low compression and catalytic system. I know this is the case for 560 SL but I am not 100% sure about 380SL. And Daimler Partsinfo does not let me choose Australian market specifically.

US version should have A 126 540 47 45 with 4 pins in original. Pin 1 should be connected with a thick 2,5mm² red wire. If OVP relay works, you will measure +12V there.

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14 Oct 2020 14:00 #260018 by Dr-DJet 450 SL 107.044 1973 Schweiz
Testing is easy:
  • Apply ground to 31
  • Apply +12V to 30
  • Apply +12V to 15 relay should energize
  • This should lead current from 30 to 87
  • Any voltage peaks should be filtered by Zener diode

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14 Oct 2020 14:55 - 14 Oct 2020 16:09 #260023 by *ClassiCars! 380 SL 107.045 1983, 450 SL 107.044 1974 Australien
Replied by *ClassiCars! on topic Overload relay for 380SL 1983 Australian delivery
Sorry about the unknown,Hi I'm Dieter, thank you for your quick reply.well I'm not sure about your question on the 1984 Model SL and whether my Car year 1983 had the low compression. etc. The relay I believe is the OVP relay has different numbers : 30,31, L and TK the fifth pin has no marking at all.I'm not sure if the Vin number would help: WDB1070452A003045.The issue I have is with the permanent lid brake light in the in Instrument Cluster (when ignition is on)I tried to attach a PDF file with some picture, not sure if it worked.
many thanks for your time
From down under
Dieter

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Last edit: 14 Oct 2020 16:09 by Dr-DJet. Reason: Double attachment erased

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  • Rudiger
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14 Oct 2020 15:15 #260025 by Rudiger 560 SL 107.048 1988 Americas (USA/CAN)
Hi Dieter, when your ignition is on, all your lights should come on. By running engine, lights should turn off.
www.autohausaz.com/pn/2015400845
Rudiger

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14 Oct 2020 15:24 #260026 by *ClassiCars! 380 SL 107.045 1983, 450 SL 107.044 1974 Australien
Replied by *ClassiCars! on topic Overload relay for 380SL 1983 Australian delivery
Hi Rudiger, thanks for your information.
I did meant when the ignition is on and the engine is running.
Cheers Dieter

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14 Oct 2020 16:08 - 14 Oct 2020 16:09 #260028 by Dr-DJet 450 SL 107.044 1973 Schweiz
Hi Dieter,

Only ABS light is influenced by OVP relay. Brake light has different meaning: Either too low brake fluid level in reservoir or hand brake is still engaged , To have separate Brake and Park Brake light seems to be Australia specific. US does have only one. So I guess brake light only hints on brake fluid level. Sorry for 84, I meant 83.

Your OVP relay seems to be a replacement.

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Last edit: 14 Oct 2020 16:09 by Dr-DJet.

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  • Rudiger
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14 Oct 2020 16:24 #260030 by Rudiger 560 SL 107.048 1988 Americas (USA/CAN)
Dieter, low brake fluid, wear of brake pads front axle.
www.autohausaz.com/catalog/k/mercedes/19...ar_sensor?s=r&page=1
Rudiger

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14 Oct 2020 16:37 #260031 by Dr-DJet 450 SL 107.044 1973 Schweiz
Hi Rudiger,

are you sure about wear of brake pads? According to owners manual and wiring diagram the 380 SL does not have that. Only 560 SL has it.

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14 Oct 2020 17:36 #260036 by Rudiger 560 SL 107.048 1988 Americas (USA/CAN)

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14 Oct 2020 18:39 #260048 by Dr-DJet 450 SL 107.044 1973 Schweiz
Hi Rudiger,

it looks like US 380 SL had wear contact, European cars not or only with ABS. So we have an issue in 1983 US 380 SL owners manual. It does not show that possibility when BRAKE light is on. In 560 SL manual it is mentioned.

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