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Manufacturer Notes: PORTABLE GENERATORS: Starting in 1977 the letter at the beginning of the serial number denotes the month. The letters A through L are used for the months January through December. The next two digits indicate the year.
Example: C830124356- the "C" indicates March, the "83" indicates 1983. This system is used on all ONAN generators and industrial engines.
Serial number plate location for this manufacturer: