ABH does not start

Hello together.

my 4.2-er ABH does not want to start. Already on the WE I noticed that the starter makes interesting noise, so from the footroom at the passenger come sounds like that, hmmm, like short circuit or similar. Last night on the way from the office I stopped, so the car drove from my job to the Aldi about 3 kms. After the purchase I started, which started as the battery was weak, and then in the first 100 meters still lit the CAT lamp, then when giving gas over 2500 tours then the CAT lamp stopped. I parked the car in front of the house, and this morning, nothing. But when the battery was empty, it's good. The starter doesn't work at all. About 3 years ago we expanded the starter, at that time the symptoms were the same, and some (commutators) should be exchanged.
The car did not drive at all in the last one and a half years because of 7-cylinder operation, only August was made fit.
If I'm not mistaken, I've been driving into the water several times in the last few days, so that even the idle was interesting, and the cockpit lighting pulsated, it probably went some water into the LiMa. Since then, however, I have also been to Slovakia and also to Budapest, and this pulsation stopped anyway.

Question: may be that because of the rainy days of the last two weeks (for 10 days it rains without a break) the starter makes worse, i.e. Can it be a contact mistake, or should I extend it again? (that's pure joy, if someone has already done it)

I was thinking of knocking the starter's house with a wood or pipe, if there is something wrong with it (pushed away commutator, ''glued' contact parts then it helps....

A friend just has another starter, but from 3.6 PT, should it fit too?


Thank you in advance

Csontos G.
Hungary