The BD9521 sealed manual battery disconnect switch helps ensure battery isolation during maintenance or other downtime situations. Cables needn’t be removed when using GIGAVAC’s double-pole, ...
I'd guess you are looking at a cap failure in the original PSU. 386 era is what, early 90s. 30+ years is a good run. If a replacement PSU doesn't have a switch, you could always hook it to a surge ...
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