On most Fords nowadays the heated mirrors only come on with the rear defogger .Dont know of any glow plug switch ever been fitted in that vehicle
On most Fords nowadays the heated mirrors only come on with the rear defogger .Dont know of any glow plug switch ever been fitted in that vehicleThis is just about the same as your truck but it doesn't have the little switch in it. It might be an after market thing previous owner installed. Have someone look around at the outside of the truck when you turn it on and off and see if anything lightens up or happens. Heated mirrors maybe. It's not a diesel is it? I was thinking maybe glow plug switch. See if the dealer has any info about it