Relays - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 10-10-2016, 08:09 AM Thread Starter
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Question Relays

My 1972 280 SE 4.5 is in need of relays. The relays I have are the tall cylindrical silver colored relays for the aux fan and the starter valve, I believe. They sit just behind the ECU for the fuel injection system. The part number is : 000 542 97 19. Apparently no longer available.

Any hints or ideas of where to go from this point?

Thanks

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
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post #2 of 8 (permalink) Old 10-10-2016, 02:17 PM
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I found a listing for them at three or four different vendors. Can't verify if they are actually physically in stock but they're out there.

They are just standard relays. A bit of wire, 5 minutes of soldering and you can use the standard "spade" end style Bosch relays available from any parts store. $3-$5 USD.
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post #3 of 8 (permalink) Old 10-10-2016, 05:06 PM
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Relay Mercedes 001 542 97 19 89 9885 000 4RA 007077 00 Used Warranty | eBay

http://www.ebay.com/itm/Rear-Window-...xU-V88&vxp=mtr

Ebay.

"If you have been in a poker game for a while, and you still donít know who the patsy is, youíre the patsy." Warren Buffet
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post #4 of 8 (permalink) Old 10-11-2016, 07:25 AM Thread Starter
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dm n stuff

thanks for the ebay links. I saw these as well, but these are five prong relays and the original ones are four prong.....

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
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post #5 of 8 (permalink) Old 10-11-2016, 07:47 AM
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Relays come in two flavors, normally open, normally closed. A four prong is always a normally open. A five prong can be wired either way depending on which pins are connected.

On the bottom of the relay, the connections are numbered: 86 is power to the coil (the thing that turns the relay on/off) and 85 is coil ground. 30 is power to the relay for the component you want to control (fuel pump, lights, etc) and 87 and 87a are power out of the relay (actually goes to the conponent). 87 will have power when the relay is energized. 87a will have power when the relay is not energized.

You can use a 5 pin relay in a 4 pin slot because the 87a pin is not connected to anything in the harness.

You just have to make sure you are buying the right relay (round pins for the old MB relays and spades for modern relays).
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post #6 of 8 (permalink) Old 10-11-2016, 10:27 AM Thread Starter
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images

Here are a few images of what I have. I am unable to make out the numbers on the relay....
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ID:	1993209  

Sherif Tewfik

70 280 SE/cab
72 280SE 4.5
78 6.9
80 280 SL
88 300 CE
94 E500
95 E420
95 E320 Cab
95 E320 Wagon
05 E55 Wagon
07 GL320 CDI
11 E350 4matic Wagon
tewfiks is offline  
post #7 of 8 (permalink) Old 10-11-2016, 12:11 PM
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Date registered: Feb 2010
Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
Location: Williamsburg, VA
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I take back what I said. I just went and pulled my old wiring harness and surprise, not all the relay sockets on my W108 4.5 will accept 5 pin relays, so ignore what I said.
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post #8 of 8 (permalink) Old 10-11-2016, 12:49 PM
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Suggest you contact this seller on ebay.

Relay Mercedes 001 542 02 19 85 30 87 Used Full 60 Day Warranty | eBay

I suspect he has exactly what you need.

D

"If you have been in a poker game for a while, and you still donít know who the patsy is, youíre the patsy." Warren Buffet
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