I have the electrical schematic for the car but it does not show the location of the relay. The shadetree has owned a couple of 115/240d but had never worked on a 115/300d.

The MB mechanic I use in Corpus Christi is the head mechanic for the local MB dealer. He does after hours work on the side. I have used him a few times and he seems to know what he is talking about. He told me the relay for the 1975 115/300d is silver and about the size of a cigarette package. He reckoned it was under the steering column but I can't see it from looking up from the floor area. I think I will pull out the instrument cluster and try from there. I can't believe that for a component that needs to be replaced from time to time that they would make it that hard to find. Still, that kind of logic is why I am working in the muc and the engineers have clean offices.

Randy, thanks for the good words about the car. I really did luck out when I found this one. I told my son that he can use the car as long as he wants to and doesn't abuse it. Fortunately he is not hounding me for a Mustang, for all the good that would do. The mnute I see any signs of abuse I get it back and he gets my 1982 Chevy Diesel truck that is mostly held together by the foam they use to seal holes in houses. Still it runs like a bat, gets 20 mpg. and loves fry oil.