Battery Kill/Disconnect Switch problem/replacement

Years ago I went thru this too. Found out I was using the wrong amp rated switch.
When they started raising the alternator amps (30 up to 100)the switch couldn't handle it.
Meaning the switch may say 200 amps momentarily but 20 amps continual.
We installed a 100 amp alt in a car ,the guy had lots of electronics and radio amps and the such. We burned out 3 switches till the light bulb came on and figured out the problem. Went with a 180 amp continual,problem solved.