There are 2 systems on my bus one battery under the hood one under the bus door. When putting batteries back in I accidentally put the one underneath in backwards and blew some fuses. I replaced the fuse that went to the radio because it wouldn’t work. But when I started the bus it wouldn’t shift out of park, I twisted key once and was able to shift into neutral then start it, and after shift to D or R. This overrode the shift interlock actuator which has a solenoid that maybe I blew. But when I turned it on it still wouldn’t shift snd the battery seemed to draw even fast almost visibly. So I put the old one back in and slept on it then a friend told me check the fuse number 11 it was empty so I put one in and it shifted and my breaks and blinkers worked. Something is still drawing it down though I can trickle charge it all night then start it drive it somewhere and then if i let it sit it won’t start back up. I don’t know what to do I’m about to drive from Seattle to Cleveland I plán to just stop every night in front of a auto store so I can jump it and continue on. It’s frustrating cause all was well with it but I fell asleep with the lights on and killed the battery’s then after recharging them I put it in the wrong way and created all this stress for myself. So yea a parasitic draw somewhere is taking it down checked it while running snd was at 14 amps. When I check them after it sits they’re around 11 amps and leaking slow. It is cold here but that shouldn’t cause it to drain batteries are said to be good and I can charge them then check them when not connected and they stay above 12 amps, any help would be awesome. Shared with this is the schematics I got from my friend.

 

What year and engine, please?

 

2003 7.3L diesel

had it in a shop today said when I put battery in backwards it blew the regulator on the alternator. So when the bud was on the alternator was testing as good but it wasn’t being regulated.

should do the job!