Open your hood then take the black cover of that covers the ECU's on the passenger side ,underneath you see all the relays or some of them ,turn your blinker on that is working then touch the relay (Pink or blue one ) , then you will know for sure if it is the one or not ,the one that clicks is the one ,you will feel it on your finger.
If you have a 2nd car test that one,that relay should fit the same, it is only the colour that changes ,if you can live with a black coloured relay under there ,the w140 likes to show of it's pretty colours ,lol.
A W140 relay cost's what ? $75 only because its for the prestige 140 ,the same relay in black colour to confuse everyone costs $5 or less from an auto parts store ,end of the day it does exactly the same thing ,make the blinker blink ,lol , all you need to make sure when you go buy one ,take your w140 relay with you then compare them when you buy it ,most cases even the part number on them is exactly the same and check the pin connections order (look at the relay number that's on it).
Behind the cluster all you see is the click click click for the blinker when it is on noise making thing .
My last relay I swaped over from a Holden into my S500 ,perfect fit & function .:thumbsup:
Just had a look at that AutohausAZ parts warehouse ,not that bad on pricing :
http://www.autohausaz.com/search/pr...800016@Mercedes&modelid=1195398@600SEL&year=1992&cid=relay@relay&gid=3608@Multi Purpose Relay
.Don't buy anything until you have tested another relay 1st