Starting Issue 850 Mkii

[Catteeclan]

Are those readings from a trusted meter? 16.9 volts is a little on the high side for comfort but that's a different prob than the non starting. 

You can use a meter to test the output from the solenoid and then to the starter, you'll check the starter cable at the same time. Check the engine earth is good too, easy way is double up with a jump lead.

Starting motor bushes could be a good call too.