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The ECM B fuse in your 1989 S-10 may be blowing due to a short circuit in the wiring, a malfunctioning ECM (Engine Control Module), or a faulty sensor that is drawing too much current. Inspect the wiring harness for damage or frayed wires, and check for any components connected to the ECM that could be causing a short. Additionally, consider testing the ECM itself for faults. If the problem persists, it may be advisable to consult a professional mechanic for a thorough diagnosis.

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1mo ago

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