Hi

We have machines running at a carbon production plant.
From early on we experienced problems with flat batteries.
The alternators has been replaced once due to dirty conditions, but, according to tests done recently, they are all charging correctly
Forklifts are also fitted with fleet management units, but, according to tests, the current draw is not enough to run the battery flat. I know lights left on, break lights that short because of carbon build up and carbon build up in the alternators can all be causes of current draw. When current draw tests gets done, we go through all the standard type tests, but we cannot seem to maintain full powered batteries. We are in the process of fitting a dust proof alternator, but if the current alternators are charging correctly, I don't really see how this should solve the whole issue.
Is carbon maybe causing the battery to lose amps?
What simple tests are there to determine where the amps gets lost, if its not through the standard means of power usage

Any advise will be appreciated