Is it absolutley Necessary for there to be a fusible link connected your battery of 94 Chevy S10 Blazer?

No, it's not absolutely necessary to have a fusible link directly connected to the battery of a 1994 Chevy S10 Blazer. While they're commonly used, their purpose is to protect the wiring harness from high current events like short circuits. If the wiring harness is otherwise well-protected (e.g., through in-line fuses and circuit breakers at various points in the system), a dedicated fusible link at the battery might be redundant.

However, many 1994 S10 Blazers *did* have fusible links as part of their original design. If yours is missing, it's likely a safety feature that should be restored. Replacing a missing fusible link is a relatively simple repair, and it provides a critical layer of protection against significant electrical issues that could damage your vehicle or even cause a fire.

In short: Not strictly required, but strongly recommended for safety.