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Hazards turning on by their self and then draining the battery.


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Mattlwood
New User

Apr 2, 2021, 12:19 PM

Post #1 of 4 (342 views)
Hazards turning on by their self and then draining the battery. Sign In

Hello, I'm searching for help for an electrical problem with my 2011 ford focus. The issues is that the hazards will turn on randomly on their own about once every two to three week. Sometimes they will turn on at night or when I'm away and it will run untill the battery is drained. I've taken it to a mechanic and talked to few others and they have said they will have to wait untill the fault happens to diagnose the problem. The issue with that is they turn on randomly and only once every two or three weeks. It's not practical for me to leave the car sitting at the shop that long hoping they can catch the problem occurring. Im wondering if there might be another solution to fix the problem. I've decided to install a battery disconnect switch to disconnect the battery when away from the car for long periods of time so the battery won't drain. Im curious if there's a way to install a switch in the cab of the car that will disable the hazards so I won't have to disconnect the battery everyday. Is it possible to wire a switch in that would disable the hazards? Or could the problem continue with the hazards disabled. Another thing I was thinking I could do is run a battery disconnect into the cab of my car so wouldn't have to pop the hood everytime I want to disconnect the battery. Any help would be really appreciated.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 2, 2021, 1:29 PM

Post #2 of 4 (326 views)
Re: Hazards turning on by their self and then draining the battery. Sign In

What they tell you is the truth. You can't fix what isn't broken.

It sounds like this may be related to the security alarm system. When the alarm triggers it flashes the 4 ways and pulses the horn. I assume your horn still works so that would not be likely but that doesn't mean the BCM couldn't be triggering the flashers alone. The flashers are completely controlled by the Smart Junction box and that could be the source of your problem also.

All of this is just speculation and guessing. As the mechanics told you, nothing can be confirmed unless the problem is present.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Apr 2, 2021, 1:30 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Apr 2, 2021, 4:13 PM

Post #3 of 4 (313 views)
Re: Hazards turning on by their self and then draining the battery. Sign In

So right - can't fix what isn't broken. Guessing is costly so is wrecking a battery if ignoring this.
For a clue I ask if they work when you purposely use them? Also do you or a prior owner if known use them many times a day such as maybe a delivery vehicle?
If so the switch is on with directionals as one part if trauma to that lever is a maybe or definite it might be damaged? It's all guessing only maybe raise odds of something.
For now I suggest lube the cable as best you can and hood latch so that doesn't wear out. Nice idea to try to unhook battery from inside IMO isn't practical,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 2, 2021, 4:35 PM

Post #4 of 4 (310 views)
Re: Hazards turning on by their self and then draining the battery. Sign In

You can try pulling fuse #8 20A overnight. It's in the under dash fuse box (smart junction box). That is just for the flashers and turn signals.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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