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  1. How to Replace a Corroded Car Battery Terminal, Car Battery Terminal: step 1, image 1 of 2 How to Replace a Corroded Car Battery Terminal, Car Battery Terminal: step 1, image 2 of 2
    • Remember to remove your car key from the ignition and shut off the car before performing this guide.

    • Locate the terminals on the top of the car battery. Next to each terminal is a positive(+) or negative(-) sign, indicating the charge.

    • The positive terminal looks to be in working order, but the negative end has a lot of corrosion buildup. This terminal needs to be replaced.

  2. How to Replace a Corroded Car Battery Terminal: step 2, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 2, image 2 of 2
    • Find the nut located on the side of the terminal.

    • Using an adjustable wrench, rotate the nut counterclockwise to loosen it.

    • Use an appropriately-sized wrench or socket, not channel locks as shown in the photo.

    • You do not need to loosen the nut all the way off the bolt, but just enough to loosen the terminal's grip on the node.

  3. How to Replace a Corroded Car Battery Terminal: step 3, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 3, image 2 of 2
    • Always remember to remove the negative terminal first before the positive terminal. This will prevent shorting to the ground and possibly causing shock or a fire.

    • Carefully use a rag to lift up the terminal off of the battery node.

    • Be cautious when handling battery corrosion, as it can irritate the skin and is harmful if it comes in contact with your eyes.

    • Place the terminal on a rag or towel and make sure it doesn't come in contact with the battery node.

  4. How to Replace a Corroded Car Battery Terminal: step 4, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 4, image 2 of 2
    • On the positive terminal, locate the nut along the side.

    • Using the wrench, rotate the nut counterclockwise.

    • You do not need to fully loosen the nut off the bolt, but just enough for the terminal to be easily removed from the node.

  5. How to Replace a Corroded Car Battery Terminal: step 5, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 5, image 2 of 2
    • Using a rag, carefully remove the positive terminal from the battery node.

    • Place the terminal on a rag or towel, and make sure it does not come into contact with the battery node.

  6. How to Replace a Corroded Car Battery Terminal: step 6, image 1 of 3 How to Replace a Corroded Car Battery Terminal: step 6, image 2 of 3 How to Replace a Corroded Car Battery Terminal: step 6, image 3 of 3
    • On the negative terminal, locate the nut on the side facing upwards.

    • Using the wrench, rotate the nut counterclockwise and remove it from the bolt.

  7. How to Replace a Corroded Car Battery Terminal: step 7, image 1 of 3 How to Replace a Corroded Car Battery Terminal: step 7, image 2 of 3 How to Replace a Corroded Car Battery Terminal: step 7, image 3 of 3
    • Take the wire plate on top and remove it carefully from the bolt.

    • At this point, it is fine to handle the metal plate with your hands since the terminals are disconnected from the battery and there is nothing completing the circuit.

    • Remove the bottom wire plate from the bolt, placing it carefully to the side.

  8. How to Replace a Corroded Car Battery Terminal: step 8, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 8, image 2 of 2
    • Set aside the old battery terminal, and replace it with the new one.

    • Replace the wire plates in the order they were taken off.

    • Although it is not necessary that the plates be placed in the same order again, it is generally a good idea to go with the order that it came in.

  9. How to Replace a Corroded Car Battery Terminal: step 9, image 1 of 2 How to Replace a Corroded Car Battery Terminal: step 9, image 2 of 2
    • Place the flat washer and the screw-on head that came with the battery terminal onto the vertical bolt.

    • Tighten the head clockwise and make sure the wire plates are secured.

    • Not all battery terminal packs come with a washer and screw-on head. If your pack comes with a nut, use the wrench and tighten the bolt clockwise.

  10. How to Replace a Corroded Car Battery Terminal: step 10, image 1 of 1
    • Using a rag, place the positive terminal back onto the positive node.

  11. How to Replace a Corroded Car Battery Terminal: step 11, image 1 of 1
    • Place the negative terminal back onto the negative node.

  12. How to Replace a Corroded Car Battery Terminal: step 12, image 1 of 3 How to Replace a Corroded Car Battery Terminal: step 12, image 2 of 3 How to Replace a Corroded Car Battery Terminal: step 12, image 3 of 3
    • On the negative terminal, use the wrench to rotate the side nut clockwise to tighten it.

    • Next, perform the same action on the side nut of the positive terminal.

    • To ensure a secure connection, be sure the nut is snug and that the terminal can't come off easily.

Finish Line

15 other people completed this guide.

David Wright

Member since: 02/23/2015

607 Reputation

1 Guide authored

Team

Cal Poly, Team 12-4, Green Winter 2015 Member of Cal Poly, Team 12-4, Green Winter 2015

CPSU-GREEN-W15S12G4

5 Members

7 Guides authored

6 Comments

Nice post. Shop car battery at batterybhai and their expert technical team come to install the battery with all battery replacement tools kit.

mayank tanwar - Reply

very interesting post. Thanks for sharing it.

https://www.sarexports.com/product-categ...

Raman Malik - Reply

I change negative terminal to new one still have corrosion why?

אנדריי מזילו - Reply

They are corrotion after doinging this within a4 to 5 month time the red cable is worst

Carol - Reply

Use Petroleum-Jelly (preferably) OR if not there then

use Vaseline onto both the Terminals( +, -ive) to prevent rusting of your both terminals of Battery PLEASE .

SANJAY KHANDELWAL -

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