Battery posts corrosion
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Senior User
Joined: Jun 2010
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Battery posts corrosion
Hello new to this part of the site but, my question is that my '04 positive battery posts will corrode within days of cleaning and coating them. Even went old-school and tried grease to no effect. Seems worse on primary battery than backup. If this has been asked before please forgive me as i searched and came up empty. Thanks in advance for any help.
Fleet Owner
Joined: Nov 2003
Posts: 27,881
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Verify all the battery grounds are in good shape.
Charge the batteries and then load test them individually.
Do you have a voltage gauge to watch when the alternator kicks on? If so, what is it?
Consider testing the alternator as well.
Charge the batteries and then load test them individually.
Do you have a voltage gauge to watch when the alternator kicks on? If so, what is it?
Consider testing the alternator as well.
Elder User
Joined: Jul 2009
Posts: 919
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From: Smiths Grove, KY
Has this been happening for a while or did it only recently start?
Have you recently replaced your batteries?
From what I understand corrosion occurs due to acidic gas reacting with the lead in the battery post. A certain amount of gas is normally vented when the battery is in use, however you might be venting too much gas. Also sometimes there is a slight acid leak. The leak can be almost undetectable but can be enough to cause the situation you are describing.
Edit -- The red and green donuts that go under the cable connectors are treated with a chemical to slow the normal corrosion reaction.
Have you recently replaced your batteries?
From what I understand corrosion occurs due to acidic gas reacting with the lead in the battery post. A certain amount of gas is normally vented when the battery is in use, however you might be venting too much gas. Also sometimes there is a slight acid leak. The leak can be almost undetectable but can be enough to cause the situation you are describing.
Edit -- The red and green donuts that go under the cable connectors are treated with a chemical to slow the normal corrosion reaction.
Tuned
Joined: Jun 2004
Posts: 338
Likes: 2
From: Northern MA
Well, there are a couple things you can try. It could be that the primary battery is failing and getting overcharged/ofgassing. Check the water levels. If you can park the truck for a couple days, disconnect both batteries, clean all the cable and terminal ends with a terminal cleaner, rinse everything with a mild baking soda/water wash. Assuming both batteries are charged the same prior to starting, measure the voltage and or have a load test done on each. They need to be very close, 0.2 volts of each other. Apply a little green loctite around the joint between the case and battery post if leakage of acid is suspected. If the batteries are 2004, it may be time to head down and get a new pair of motorcraft batteries. (Ford parts have been super competitive on prices)
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