WASHINGTON -- Federal safety officials today issued a rare consumer advisory to owners of Ford Motor Co. vehicles that have been recalled for repair of a cruise control switch.

The National Highway Traffic Safety Administration said it is concerned that only about half of nearly 10 million vehicles have been returned for the repair.

"Failure to have the switch disconnected could lead to a vehicle fire at any time," the agency advisory said.

NHTSA says fires can occur while vehicles are parked with the engine off. Some fires have burned homes with attached garages, owners claimed.

The repair involves installing a wiring harness around the switch. NHTSA said in its advisory that owners of unrepaired vehicles should at least have the switches disconnected.

Some dealers provide drive-through service so there is no need to schedule an appointment or leave the vehicle, the agency notice said.

Ford spokesman Wes Sherwood said the company supports the NHTSA advisory but is unaware of new reports of fires, accidents or injuries. NHTSA spokesman Eric Bolton said the agency has received about 60 complaints of fires involving the vehicles since last August.

NHTSA said the automaker is re-notifying owners of the vehicles.

Ford has conducted the recall in stages. NHTSA said the full list of affected vehicles includes:

• 1993-2004 Ford F-150

• 1993-1999 F-250 (gasoline engine)

• 1993-1996 Ford Bronco

• 1994-1996 Ford Econoline

• 1997-2002 Ford Expedition

• 1998-2002 Lincoln Navigator

• 1998-2002 Ford Ranger

• 1992-1998 Ford Crown Victoria, Mercury Grand Marquis, Lincoln Town Car

• 1993-1998 Lincoln Mark VIII

• 1993-1995 Ford Taurus SHO with automatic transmission

• 1994 Mercury Capri

• 1998-2001 Ford Explorer and Mercury Mountaineer

• 2001-2002 Ford Explorer Sport and Explorer Sport Trac

• 1992-1993 and 1997-2003 Ford E-150-350 gasoline or natural gas vehicles

• 2002 Ford E-550 gasoline engine vehicles

• 1996-2003 Ford E-450 gasoline or natural gas vehicles

• 1994-2002 Ford F-250 through F-550 Super Duty trucks (gasoline engine)

• 2000-2002 Ford Excursion (gasoline engine)

• 2003 Ford F-250-F-550 Super Duty, Ford Excursion

• 1995-2002 Ford F-53 motor home chassis

• 2002-2003 Lincoln Blackwood