I have a 2006 National TropiCal with a Freightliner chassis and a Cummins 300 hp engine. I occasionally have the CHECK ENGINE light up. I have someone with the Insite program and scanner. The problem is that I cannot find the round 9-pin plug to attach the scanner. Any clues??
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There are generally 2 plugs that you can use. There is one back in the engine compartment and normally there will be one under the dash.
Maybe someone with a like coach will chime in and give you the exact placement.
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2004 Triple E 3903 Empress 400 ISL