Jeffroooo,

How are you with the multmeter? You're really going to have to start measuring currents now.

Fastest way to measure consumption (or leakage) is with a clamp on meter. Once you have found there is a large draw on the battery, you can then start checking the sub-circuits one by one, or consumer circuits as they are often referred to in the land of auto.

Alternators are for keeping your battery charged and shouldn't be used to charge a flat battery. If it is your only option, say if you were away from home, then sure you have to. Alternators only like a 75% duty on them, and not continuously either.

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1995 E300 Diesel