Mercedes All Models Onboard Battery and Alternator Condition Tester

Here is a handy little device that will allow you to easily check the condition of your battery and the output of your alternator. You can install in your engine compartment with the supplied velcro and hook it permanently to your battery posts. Since it is only on when you push the test button it will not drain your battery.

I particularly like to install it in cars that I don't drive all that often. It allows me to monitor the charge of the battery without having to pull out one of my other testers. Great for the wife's car. If she ever has a starting problem you can have her push the button to determine if it is a battery or charging issue...

Here you see it installed in my own 1959 220SE.