ML4 - Check For B+ at MIL Bulb/Socket

- Key "ON", engine "OFF".

- Measure voltage from battery negative post to B+ side of Malfunction Indicator Light (MIL) bulb/socket.

- Is voltage greater than 10.5 volts?

Yes -- Go to ML5. ML5 - Check MIL Bulb Response to Grounding

No -- Service open between MIL fuse and MIL bulb. Verify service by turning ignition key to "Run" position.