How often does the relay cycle? Is it a mechanical relay? The $5 price suggests that it is mechanical. You might want to solder in a relay base and make it an annual PM to replace the relay.

It also says 55F for the max environmental temperature. That seems unrealistic. maybe they meant 55C.

After Beta testing you might want to consider a solid state relay with a healthy heat sink on it. I have a box of old 486/pentium processor heat sinks that would work very well as solid state relay heat sinks.

Any chance this will work on my 1995 S350... Man, I am lazy!

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.