1982 300CD, I removed the gauge cluster. now, my battery light and my red brake light

[gregp1962]

1982 300CD, I removed the gauge cluster. now, my battery light and my red brake light are on. Those two lights are right next to each other on the gauge cluster. It seems odd that these two lights went on exactly after reinstalling the gauge cluster. The wire connections on the brake fluid reservoir seem good. But, I did check charging and it doesn't seem to be charging. I currently have it on a trickle charger until I figure out what's up. Can anyone think of a reason for this sequence of events?