5 relays (0015420219) in '84 300SD fusebox HOT to the touch!

[JohnFitzpatrick]

In my '84 300SD (204,000 mi.), in the fusebox under the hood, there are five (5) aluminum colored, cube shaped relays (?)...all the same part #: 0015420219. I've noticed that they seem quite hot to the touch sometimes. Holy hot relays, Batman...should I be concerned? I've had the car only one year, so I don't know when, if ever, any of them were replaced. Is this a "non-problem", or should I replace them? If "yes", where can I get these at a good price?
Thanks. Be well, John

[jdc1244]

While installing my new radio in my '85 500 SEL (208,520 miles) I managed to burn out a fuse due to an exposed wire. My hand brushed one of the silver square “relays� you mentioned while I was replacing the fuse and I also noticed it was hot. I assumed it was because I had the acc switch on and the door and other lights burning. As you know when the car is off the clock still runs and the hot wire to the radio memory is on and who knows what else; at this point I believe it’s a “non problem.�