Thanks for getting back to me so quickly FreeThinker. I made all my generators the same size as their reactors and turned the pumps on in the reactors, and even put a little LH2 tank with a yellow fuel line directly to the magnetic nozzle, but the engine still says 'insufficient electricity' even though I have full EC, mega joules, and charged particles with the engine at full throttle. Is there another way to make sure fuel is getting to the engine? I've never had a problem with that before and in the VAB Kerbal engineer says I have lots of dV. If you or anyone else has any other ideas I'd really appreciate it, I've tried everything I can think of.
Edit: Thanks for the additional info, I tried to replicate your setup with a brand new download of KSP 1.1.3 and KSP Interstellar Extended 1.9.11 but I keep getting status 'insufficient electricity'.
When I use Hyper-Edit to give infinite fuel, the status on the magnetic nozzle changes to 'nominal' and prop. requirement met goes to 100%, but the fuel flow, thrust, and specific impulse all stay at zero. I don't know how to get my log and post it, but if you feel like checking it out I'll figure it out.
Edit 2: Here's the log just in case:
KSP: 1.1.3 Windows 64bit (brand new download)
Problem: No thrust/ISP on magnetic nozzle from KSP-I
Mods: Full install of KSP-Interstellar Extended 1.9.11 from SpaceDock
from CKAN: TweakScale v 2.2.13
AmpYear 1:V1.3.6.0
HyperEdit 1.5.2.1
REPOSoft Tech-Agencies 1.3.6.0
Reproduction (probably only happening to me): Magnetic nozzle attached to Large Fusion reactor attached to Thermal generator attached to liquid hydrogen tank attached to command pod with radiators
https://www.dropbox.com/s/0jmiojn5f58anib/output_log.txt?dl=0
Thanks a lot if anyone has the time!