Possible battery drain- slow crank

[gibbogr]

So I guess it all started like 6 months ago in the winter. If I plugged my truck in at night it would start fine. After work I would try to start it and it would either crank really slow till it fired up or it would kill the battery's. But when i would jump it off another truck it would crank fast like it should. So I had the altanator tested and they said it was bad. So I got a new one and got 2 new batteries right away too. The problem seemed to be fixed. Then a couple days ago it started again. I would plug it in at night and it would start fine. But after even sitting for like 6 hrs the batteries will be dead if not plugged in. Where should I start?

[JSchuricht]

Check all the connections at the batteries and alternator. Check the voltage with a multimeter before and after starting the truck. Disconnect the batteries and put a multimeter in series with one battery to measure current draw with the truck off.

[Dobbelaar]

Had almost the exact issue this winter .... I checked all my batteries and replaced one that was bad. But the problem was the starter acting up, I replaced the starter with the DB electrical starter and probem fixed.

DB Electrical - NEW STARTER FORD 7.3 DIESEL E F TRUCK VAN POWERSTROKE 94-03

[gibbogr]

I'm starting to think it may be the starter as well now. Because I am now unable to even jump it. It just turns the motor over maby one time then just stops. I've just never had a starter just crank slow like that. For me at least when the starters go on vehicles they just stop working. But looking back on it there has been several times in the last couple months that it will crank slow before it fires up. Guess I didn't pay much attention to it because it still fired up.

[gibbogr]

hey. ya, it turns out it was the starter. i guess that one just got wore out. thanx for the help tho'