I can't seem to be able to open up my 124 MAS relay to check to solder connections- it has the metal 'cage' around it and the on/off knob on top. I'm not sure if getting one or both of these off is the way in, but I can't get either to budge.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

..to show what I'm on about

Attached Thumbnails

 

__________________
1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys

I had to replace the MAS not long ago. Someone correct me if I'm wrong, but I do not believe these are owner-rebuildable, nor can they be opened.

Dealer price was just over $400.00

Remans are less but who would trust an electrical reman?

The knob on top simply turns - then you lift the MAS off by pulling up.

To test fuel pump relay, jumper pins 1 & 2. If you hear the pump turn on, you're looking at replacing the MAS unless your able to open it up and determine what's wrong inside.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"