door ajar issue - 2013 SEL

[mdjbhouse]

Not sure where to post this exactly so here goes.  Having an intermittent door ajar issue and last night the alarm goes off at 3:00 am and my dome lights won't go off so time to get serious about addressing this.

I can find a few suggestions online regarding spraying the door latch etc. but then the last one I found related to an F150 said to check the wiring harness which I think makes sense and I plan on doing.  I was also looking for a replacement wiring harness as an alternative to maybe soldering wires assuming I can even figure out which ones might be broken but not much luck finding that part # and I know in the past the members here have been good at sharing info like that.

 

Any suggestions on what fixes work here I am also open to hearing about.

[Samurai Edge]

First and foremost, as you didn't mention, Is the door ajar alarm actually as a result of you not fully closing the door?

  - It may look closed, but doesn't mean it actually is.

 

First thing I would do is clean up the door latch and use some grease on that latch.  You can spray it with a lubricant, like WD-40 but it doesn't last as long as a good grease will.

[mdjbhouse]

Door is definitely closed. The door ajar issue is pretty intermittent.  Stays on for a while, can't seem to get rid of it and then just today it is gone again. 

I did spray it with some electrical contact cleaner some time ago but didn't seem to make much difference. 

I also live in a cold climate so I have been waiting for some better weather to look at it and a nice say yesterday is now snow today.

The weird part is the alarm going off randomly, unless that is how it's supposed to work if the interior lights stay on for a certain duration like 3:00 am the other night, then again this morning. 

I parked it in the garage at lunch and 'door ajar' was gone and interior lights were off.

 

So related to a lubricant. I do have some white silicon grease in a spray can.  Is that a good grease option?