Ok I have a neighbour that also has a 2004 F150 and he has had an issue since he started to use his keyless entry.Had never used it and then decided to activate it.Well since then he has had his battery drain and needs a jump on many occasions to get it going again.I am figuring that the system is linked with the security system and some how he is getting a good short which is draining the battery.Has anyone had any issues or have any ideas.Thanks.