Acura NSX 1991 Manual page 210

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CAUTION:
• Puncturing the insulation on a wire can cause poor or intermittent electrical connections.
• Bring the tester probe into contact with the terminal from the connector side of wire harness connectors in the engine
compartment. For female connectors, just touch lightly with the tester probe and do not insert the probe.
TESTER PROBE
RUBBER SEAL
WIRE HARNESS
TERMINAL