my battery will not hold a charge. keeps draining
 

I've charged 2 different batteries over night and then disconnected them in the mourning only to find the car still won't start in the evening when i get home from work. its a 1980 300d. could it be the solinoid on the alternator. I've heard that the dreaded c/c servo can drain a battery.
any ideas on what it might be, or how to track it down. Thanks RAY M

Ray you need to start isolating each circuit in the fuse box and look for a current draw. That will narrow your hunt. Is your alternator (idiot) light staying illuminated after you turn the car off?

Disconnect the positive cable and put an ammeter in series to it from the positive terminal on the battery. You should see a current draw. Begin removing fuses until the draw stops. When it does, you'll know the circuit drawing the current.

thanks i'll try that