Main Battery Switch not working?

[crieders]

After putting buss bars on batteries over the winter, i turned on the battery switch on the other day and nada. No power.
The volt meter shows normal current in the batteries and they check out with a meter
When i put the buss bars on, I dropped a wire on one of the poles, a positive, and was a big spark but seemed everything worked right after that.
Question is whether I should replace the battery on switch at the panal. Fuses are all good. I did check that.
Panal is from 1989, according to the label.

[waughoo]

Have you opened the panel and checked for power at the back side of the 1 2 both switch?  I would try that before going direct to replacement.  I think you have a bit more troubleshooting to go yet.