[aerojon]

corrosion causes resistance..

 

[Mimmi]

I have fixed few of them with common battery cables (with terminals attached), crimp connector and heat shrink tube (with glue) over connector.
If you do not have crimp pliers you can use bolt version of connector. Do not forget heat shrink tube.

 

[Germaniac]

I'd check the ground cable first - maybe it had just come loose and needs to be fastened again (clean the connections if rusted, then seal them). If this cable needs to be replaced, look at 32020066 by OEM | Battery Cable - Ground (Negative) 2006-2011 B207 B284 .

 

[bofusric]

Thanks for the replies. The ground cables were checked and cleaned. Terminal posts and cable connections cleaned. I started and let run for about a minute and positive cable was getting warm. I will be buying a repair cable and crimp connection. seems like easy and quick thing to do. Went ahead and bought new battery for peace of mind.

 

[bofusric]

I replaced the battery positive cable with NAPA Battery Cable Saver and voltage is now 14.6 and cable does not get hot anymore. Yes!! I ordered a factory negative cable for good measure since that cable was getting warm as well.

 

[Bob12312357]

Check for pos/neg voltage drop at the alternator & starter as well.