If you had the wiring diagram you could check it, if it was a hard failure. Given the circumstances it would be pretty tough. Would have been easier to do some testing before you took it apart but too late now.

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well i put the switch in and didn't start.. jump it at the starter and firer up... check the volts at the battery while runnig and it was 14.86 here's a funny question. my 2006 nissan frontier battery with no key on reads 12.52 volts, now when the meredes is off it reads 13.87 volts. is my mercedes battery wasted?????? also when i keep the charger on it seems to fire up more consitant.. i do have a clue on this.... o' well, i'll see the dealship when i can.. nearest one is 200 miles......... love the car anyway......

What does the Nissan read when it is running??
The MB is too high, or at least I believe if the alternator was checked it would be running too high, when running the alternator should put out 13.8 to 14.2v

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nissan running reads 14.6 volts and mercedes reads 14.88 volts running...

If you switch on your headlamps for 10 seconds and switch off then test the voltage it would have dropped.

I have seen this happen on a car I had, the SG of the electrolyte was out of whack, there was more acid than water, some distilled water and placing the battery on a tire to shake it up and put back into the car solved it. In most cases running like that for too long can render a battery completely dead.

I check the SG of the electrolyte every second oil change, I have added about a glass worth of distilled water in 2 years. Still cranks good - I have the white MB battery.

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1995 E300D - The original humming machine (consumed by Flood 2017)
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Find a high quality voltmeter to check it against, shouldn't be getting voltages this high.

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it's a sealed battery,,,, can't check.. well try a different tester... i think since i don't know how old the battery is.. i'll relpace it,, it seems to be starting fine with the new switch anyway........ time will tell..thanks dave.

well, i had the battery test and no good... put the new one in and have driven 500 miles or so, and things seam to be on the upand up.. even drove though snow and rain on my trips........ thanks to all that help. dave.