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Battery terminal corrosion

alarm honking alarm key in ignition cleaning battery

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1 reply to this topic

#1 OFFLINE   GrySql

GrySql

    New Flex Member

  • Ford Flex Members
  • 223 posts
  • Region:U.S. Pacific Coast
  • Location:SoCal
  • Current Vehicle:Fusion Hybrid

Posted 04 March 2015 - 05:07 PM

I bought this 2011 CPO Flex last June, it came with a new battery.  The positive terminal was pretty corroded when I finally got it home and looked the car over real close.

No big deal, I figured I'd clean it myself, that was 8  months ago.

Yesterday I finally did the cleaning job with a baking soda/water mix and various brushes and scrapers, it came out pretty clean, so far so good.

Next I installed those green/red anti-corrosion pads around the battery posts and gave everything a thin coating of dielectric grease.

 

I'd disconnected both terminals, when I went to reconnect them the horn alarm went off and the only way to stop it was to pull the negative terminal.

I tried this a few times but each time the horns alarm would honk. The Owners Manual was no help.

I was frustrated, I've cleaned lots of battery terminals on my cars with alarms and never had this happen.

 

I got on the internet and looked up this issue, a Mustang Forum had a suggestion and I tried it.

I put the key in the ignition, turned it to the Accessory position and then connected the negative cable, it worked, no alarm.

I learned something new. 

 



#2 OFFLINE   robertlane

robertlane

    Flex Fan

  • Moderator
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  • 199 posts
  • Region:U.S. Great Lakes
  • Location:Dearborn
  • Current Vehicle:Shelby Mustang

Posted 07 March 2015 - 05:28 PM

I bought this 2011 CPO Flex last June, it came with a new battery.  The positive terminal was pretty corroded when I finally got it home and looked the car over real close.

No big deal, I figured I'd clean it myself, that was 8  months ago.

Yesterday I finally did the cleaning job with a baking soda/water mix and various brushes and scrapers, it came out pretty clean, so far so good.

Next I installed those green/red anti-corrosion pads around the battery posts and gave everything a thin coating of dielectric grease.

 

I'd disconnected both terminals, when I went to reconnect them the horn alarm went off and the only way to stop it was to pull the negative terminal.

I tried this a few times but each time the horns alarm would honk. The Owners Manual was no help.

I was frustrated, I've cleaned lots of battery terminals on my cars with alarms and never had this happen.

 

I got on the internet and looked up this issue, a Mustang Forum had a suggestion and I tried it.

I put the key in the ignition, turned it to the Accessory position and then connected the negative cable, it worked, no alarm.

I learned something new. 

 

 

Exactly.  That's they way that we used to do it @ Shelby with the 2005-2014 Mustangs.


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