i have a 300E diesel 1995 had alternator rebuild about 3 wks ago did fine except battery charge light would come on when first cranked. then this week went to start it would turn over but not start. when we got it home put the charger on it it was below 40% so we charged it, started fine a couple of days happen again took it back where they repaired the alternator they said it was the battery but in new battery started fine that night. next morning same thing went to charge new battery it was below 50% please help.

what tools do you have for diagnosis?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Our battery charger has a percentage gauge on it and I use the actron super scanner automotive scan tool

charge up battery and take to an automotive parts store to have alternator checked. It seems to be bad according to what you are posting

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C