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post #1 of 11 Old 01-02-2018, 11:45 AM Thread Starter
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Positive Battery Terminal Connection

I had to replace the battery on my 2015 EX-L V6 this past weekend. While doing so I noticed that the positive terminal connector is somewhat corroded (I cleaned it up as best I could) and also very flimsy. Nonetheless everything seems to be working OK. If the tested voltage from the battery post is the same as from the connector, can I safely assume that I have adequate contact?

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post #2 of 11 Old 01-02-2018, 11:47 AM
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A little wire brush is good for cleaning those.


Did you grease the posts and add the felt rings to them before hooking everything back up? That helps corrosion from forming.




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post #3 of 11 Old 01-02-2018, 11:52 AM Thread Starter
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I used a battery terminal cleaner spray, a wire brush (part of the battery terminal brush), a Dremel and some sandpaper. With all that said, some parts of that copper connector were still not shiny copper. I did use the felt rings and some battery sealant spray after attaching the connectors. (I have seen conflicting opinions on treating the posts before connecting the clamps.) In any event the clamp does seem flimsy. Should I replace it?
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post #4 of 11 Old 01-02-2018, 11:56 AM
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As long as you can tighten it onto the post and it stays in place, I wouldn't replace it.


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post #5 of 11 Old 01-02-2018, 12:18 PM
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Quote:
Originally Posted by SAS View Post
In any event the clamp does seem flimsy. Should I replace it?
Flimsy? I guess you mean the somewhat lightweight stamped metal terminals vs. the perhaps old style heavy cast terminals or clamps. If so, you can relax. They're fine. You've already discovered that they are hard to clean. I like to use a little dielectric grease on mine. A couple ounce tube of the stuff has lots of uses and lasts forever. Sounds like you did a good job on cleaning things up.

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post #6 of 11 Old 01-02-2018, 01:02 PM
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If you are seeing copper on the connector the acid has eaten the plating from the connector. That is not a bad thing, but you need to clean it thourly and make sure you neutralize the battery acid with baking soda. Using the felt pads helps to keep the acid off the connectors as well as the spray sealant. As long as the connector can tighten down properly you should be fine.

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post #7 of 11 Old 01-02-2018, 01:40 PM
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I would try a little wire brush to test it.
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post #8 of 11 Old 01-02-2018, 03:52 PM
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Quote:
Originally Posted by SAS View Post
I had to replace the battery on my 2015 EX-L V6 this past weekend. While doing so I noticed that the positive terminal connector is somewhat corroded (I cleaned it up as best I could) and also very flimsy. Nonetheless everything seems to be working OK. If the tested voltage from the battery post is the same as from the connector, can I safely assume that I have adequate contact?
If you want to really measure the tightness of the connection for a good electrical connection, place one of the voltage probes (+) of the DVM on the post itself and the other voltage probe (-) of the DVM on the terminal connector (stamped metal clamp).

What you are doing is measuring the voltage drop across that connection.

If it's tight connection it will measure 0.1 volts DC or less, but if it exceeds about 0.4-0.5 VDC there is a higher resistance present and therefore indicates a loose connection. EDIT: You'll need a load on the battery and turning on the headlights is a good load. Engine not necessarily running either. The headlights cause current to be drawn through the connection.

You can do this on either posts/clamp of the battery. It works for connectors and ground points throughout the car.

If you care too, loosen the clamp and allow it to loosely clamp the post (movement is evident on the clamp) and measure again.

You'll find you don't need to gorilla the clamp on the post to get it to measure 0.1 vdc or less.

Finally, to answer your question, YES if both points you probe measure the same you are golden.
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post #9 of 11 Old 01-02-2018, 05:21 PM Thread Starter
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I've tested with the meter and the connection is just fine. I didn't realize that the connector was originally tinned copper and that the corrosion (and my rather aggressive cleaning) had removed the plating. I'm guessing the plating was intended to prevent oxidation, but I'm hoping that the spray sealant will prevent that.
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post #10 of 11 Old 01-05-2018, 07:57 AM Thread Starter
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Well apparently the sealant does not prevent the bare copper from turning green! Although I still have good connectivity, I think I'll change the terminal connector to a copper compression connector that is plated or one of the plated set screw connectors. I attached pictures below. I have two questions: Is one style better than the other in terms of connectivity and corrosion resistance? What size is the stock battery cable in a 2015 V6?
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post #11 of 11 Old 01-11-2018, 06:57 AM Thread Starter
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I'll post this as an update in case anyone in the future needs to know the cable sizes on a 2015 V6. There are two 4 gauge cables. After removing the old connector with a Dremel cutting wheel, I discovered that I did not have the correct size connectors, so I took my wife's car and headed to the nearest auto parts store, Autozone. Here's what I found and installed, and so far so good.
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