Trace that "standard plug" to its destination. If it terminates at the engine block, that is the one you use. When I had my Dodge 5.9 CTD the motor manual said that 4 hours was the longest it should be operated, longer just used more electricity for little gain.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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