Fuel cells not producing power

[Zaccy200]

I have no idea what has happened but fuel cells won't take in any fuel and won't produce any electric charge. I removed all my mods and reinstalled KSP but the problem still persists. I made a test craft that was a probe core and a fuel tank with a fuel cell but when I turn on the cell no charge is generated. Is this a bug in the new update or is there something wrong with my install?

 

[Geonovast]

Fuel cells only produce EC when the batteries get below a certain threshold.  I want to say it's 85%.  If your batteries are below that, then some screenshots would help.

[Zaccy200]

17 minutes ago, Geonovast said:

Fuel cells only produce EC when the batteries get below a certain threshold.  I want to say it's 85%.  If your batteries are below that, then some screenshots would help.

Ah I had no idea it worked like that. yep everything works fine it's just that I rarely use fuel cells so this was the first time I noticed it