Douggie - Did you get the manual with this machine ? The correct coils etc will be noted.
Here's a coil chart -
http://www.pinballmedic.net/coil_chart.htmlCoil resistance does not sound right - You may need to check that the EOS is still connected.
The double switch on the LHS is a "cascade" for the upper flippper.
Here's the Marvin Guide for GTB SYS3 -
http://www.pinrepair.com/sys3/index.htmYou will find HEAPS of great info in there. Unfortunately, I don't currently own a SYS3 machine to compare.
