I have a 2001 XLT 3.0L V6. I keep getting corrosion on my terminals, even after replacing them. Can this be caused by a bad battery, or something else?
The first time, the terminal was so corroded it just snapped.

Replaced the terminals and now its happening on the other terminal?



Battery is quite new, it says January 2016.

 

Battery is venting corrosive chemicals

Negative terminal corrosion is pretty standard, but not as common as it once was, depends on the battery

Positive terminal corrosion means battery is being overcharged, check charging system, voltage regulator is probably bad, alternator voltage is increasing with RPMs when it should stay at 13.6volts regardless of RPMs
This also ruins the battery, so CHECK THIS if positive terminal is corroding

You can get battery "pads" that go under the battery cables on the terminals, it helps slow corrosion.

You can also seal the terminals with dielectric grease once they are tight

 

Hm. That's weird because it was the positive terminal that was very corroded before i got new terminals, now the positive terminal is spotless and the negative terminal is getting corroded. Someone told me vaseline on the terminals will help.

 

Leaky Interstate battery.
That was supposed to be fixed by the manufacturer, but I guess not.
I had one from new and it always leaked.
Seemed like I was always cleaning the terminals.