High Pressure A Switch Input open to MBB: Circuit shut down: T123: High Pressure Switch Trip Circuit B: High Pressure B Switch Input open to MBB: T126: Circuit A High Discharge Pressure: SCTA >150 F: Automatic, only after first 3 daily occurrences. A126: Alarm: Manual: T127: Alert: Circuit B High Discharge Pressure: SCTB >150 F: Automatic, only ... Ignition Run - Normally Open Relay Pull In. Ignition Run Only - Circuit Status. Ignition Run Only - Output Feedback.
Check for open circuit and short circuit in power supply line between inhibitor switch connector and J/B connector. (1)Disconnect the connector, and measure the voltage between terminal INHR line and body earth at the wiring harness side. (2)Turn the ignition switch to the "ON" position.MSD’s universal ignition tester (PN 89981) helps identify and get rid of unwanted ignition gremlins in single channel and coil-on-plug applications. It can perform battery diagnostics, test distributor signal, verify RPM-activated switches, simulate a ¼ mile pass with the RPM Run Mode feature, and so much more.
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