Windows 8.1 and Windows 10 on 2 SSDs

I have Windows 8.1 on a SSD
Now I want to try Windows 10 on another SSD I just installed it and it works with only this SSD in the PC
What do I have to do to use both SSD with 1 PC?
I tried to install EASY BCD on Windows 8.1 and add Windows 10 OS at SSD J:\
but WIndows 10 does not start. What can I do?
Windows 8.1 works and also Windows 10 works if I unplug the Windows 8.1 SSD


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