Hi,
What SSR did you get, can you post link to spec/data ?
Thanks.. Tom... 
https://a.aliexpress.com/_mq4h6r1
Got the black DC-AC one. Not much data/specs on it though.
But the picture on that link shows the load as being 6A 5 to 80V DC.
What that link shows is then the type of SSR you have bought is not suitable for switching mains voltages at all. Your tests with a resistance meter confirm this, as you would not get these results with an AC SSR. You will get a big bang if you connect it up.
The type of solid state relay you have is just a large FET, and not a real SSR which will contain two silicon controlled rectifiers or a single Triac.
There are two black options - the other is the triac based one, which is the one I bought - load shown as "6A 24-250VAC"
Ok. That looks like it might be the right sort. The diagram on the side certainly shows a Triac based SSR,
However, that one is marked as the type number D1F-1Z-DA and when I go searching for that part number, and so the data sheet of the device, all I find is links to the white sort of solid state relay with the DC output.
I am also surprised that when you tested it with your resistance meter as a load you got a reading from the tiny voltage a resistance meter puts out.
If you do have a power supply that gives a low voltage say 12 or 24 volts output you test it on that first. AC low voltage power supplies are often used in music systems.
Damn I see where I messed up - sorry I was not clear in my ealier post. I was testing the DIN base not the SSR itself.
With the SSR removed there is a 600 ohm resistance between one of the input side terminals and where a pin on the SSR fits in on the top. So the base comes with a protection and indication circuit (green led in the top of the base).
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