I have had this '95 F150 Mark III since May and one problem has been unsolved since then. While I'm driving down the road, the alarm will go off randomly. The horn honks and radio flashes and clicks. Back in May I started a thread about this and found that the door ajar switch was busted, which seemed to fix the problem until it started in again the next month so I unplugged the horn. I'm getting annoyed not having a horn now that I drive it more often so I need to figure this out. The truck was in a front-end accident before I got it so I think maybe a sensor is broken somewhere. Any ideas on where I should check? Any wiring diagrams available for the alarm system? Please help.

 

... Anybody care to help?

 

Come on people, help me out here.

 

I might have a diagram, but won't be able to post it till I get home.

Have you checked the door switches again?

 

Yeah, the door switches are fine. There has to be some sort of alarm sensor somewhere that is messed up, but I don't know where to look for it.

 

...

 

So I looked at the diagram, the only thing that triggers the alarm is either both door switches and the ignition tamper sensor in the steering column. I will keep looking and post the diagrams when possible.

 

Well, it was in a front-end accident, so the ignition tamper sensor might be messed up. Thanks for helping, let me know if you find anything else.