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Old 02-25-2017, 03:06 PM   #1
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Battery Terminal Corrosion

Are these vehicles prone to terminal corrosion (of the battery, not the entire car, :-)). I have quite a severe case of, I think it is, copper sulphate corrosion on the +ve terminal. The -ve looks fine. I've cleaned it up and smeared dielectric grease over the post and around the cable connector. Will see how it goes, first time for me to see one this bad. My sons Mazda 6 has always had a similar problem even with different batteries, but nothing like this. I don't think the post is leaking but difficult to tell. Not seeing other hits on this site either so thinking this is rare in the Focus?

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Old 02-25-2017, 03:14 PM   #2
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Terminal corrosion relates primarily to seepage from the battery, so it's a variable with each individual one.

Preventive coatings/treated felt washers/greasing terminals can reduce the likelihood by attempting to keep seepage away from the terminals when/if it occurs.
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Old 02-25-2017, 04:35 PM   #3
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I would pull it out, clean, and thoroughly inspect the area. I had a similar issue on the negative post and found out later the battery had split by the post and leaked battery acid eveywhere. I have a new battery now but still need to uninstall, sand, and repaint area under the battery box where rust is now developing from the battery acid.
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Old 02-25-2017, 05:31 PM   #4
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Oh, and to the Mazda - ANY remaining corrosion/acid just keeps the cycle going.

Acid needs to be neutralized, cleaning terminal alone is NOT enough (baking soda for a cheap/easy solution).
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Old 02-25-2017, 09:32 PM   #5
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Mine's doing that exact thing, and I'm having voltage issues. If even so much as the doors and truck are left open even so long as it takes to detail the car, it won't have enough voltage to allow the car to start.

I know I need a new battery, and I definitely need to clean the snot out of the wire terminal itself.

Probably a project for next weekend.
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Old 02-25-2017, 10:21 PM   #6
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All of my Mitsubishi had terminal corrosion issues, sprayed them with that red spray stuff and covered them with dielectric grease but it would still come back.
Hated it but they still started and never drained the battery.
My explorer is the only ford i had with this issue. It was chronic and I had to check it constantly.
One day it wouldn't start after work during a snowstorm of all times and when I cleaned off the corrosion i realised I no longer had a clamp on the terminal, it dissolved it away. It did not take long for it to do this. Some rigging of the clamps remains got me to my neighborhood but not home before it failed and needed to be towed.
It required replacing the whole cable, the box on the terminal and a part of the harness.


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Originally Posted by Slo86GT View Post
Mine's doing that exact thing, and I'm having voltage issues. If even so much as the doors and truck are left open even so long as it takes to detail the car, it won't have enough voltage to allow the car to start.

I know I need a new battery, and I definitely need to clean the snot out of the wire terminal itself.

Probably a project for next weekend.

Mine acted like it was a dying battery and was hard to start sometimes after leaving a door open for a bit before the terminal clamp failed.
After it was replaced I had had no problem with the battery(it tested fine according to dealership).

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Old 02-25-2017, 10:38 PM   #7
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Man, the Romans would be happy.

All those salts of lead to sweeten the Wine.
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Old 02-26-2017, 03:12 AM   #8
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I think your battery is bad. While charging acid is leaking out of tiny gaps at the terminals. You can neutralize the acid with a can of Coca-Cola and a toothbrush to scrub it with. Get a new battery soon. This problem can't be stopped once it's started.

Coca-Cola, then spray foam engine degreaser on the areas acid has touched, then fix the paint before rust sets in.

Best of luck.
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Old 02-26-2017, 01:09 PM   #9
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OK folks, thanks for the input. I'll check it again this weekend. If it's looking like an ongoing issue, I'll likely replace the battery. It's a 2015 with 23K on the clock...I may be able to get a warranty replacement?

Thanks
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Old 02-26-2017, 05:47 PM   #10
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Quote:
Originally Posted by iceflow View Post
OK folks, thanks for the input. I'll check it again this weekend. If it's looking like an ongoing issue, I'll likely replace the battery. It's a 2015 with 23K on the clock...I may be able to get a warranty replacement?

Thanks
Depends. Maybe a prorated discount. Good luck.
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