Ford is recalling 327,000 F-Series pickup trucks in North America for a second time to fix problems with engine block heater cables that can cause fires.

Back in December, the company issued a recall for 874,000 trucks due to water and contaminants getting into cables and causing corrosion. This problem was also causing electrical shorts and fires.

327,000 owners took trucks to dealers for the fix, but an inspection may have inadvertently damaged the cables. Dealers have been instructed to disable the cables for all recalled trucks and all owners will get new cables when the parts become available. The company is advising people not to use their engine black cables.

The recall covers F-150s from 2015 through 2019, as well as Super Duty trucks from 2017 through 2019. The fire risk only exists when the cables are plugged in.

Engine block heater cables are plugged into electrical outlets or extension cords to keep oil and anti-freeze warm in extremely cold temperatures. They are used largely in the northern U.S. and Canada.

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