I just bought this 92 cummins and it has a brand new Napa battery. It drains like overnight once you charge or jump it it fires up. Hooked up a draw light contraption that showed draw when lights ect are turned on and otherwise shows no draw when everything is off. Then hooked up a voltage meter and when I start the truck it charges really well but as soon as I turned the truck off the battery drains rapidly. This was happening before I bought this new battery. Someone metioned a crankshaft sensor does it sound like this could be my problem ? Or any other opinions...thanks in advance

 

Sounds like a dead short somewhere.
Can you check for codes with this yr truck ?

 

I don't think I can check for codes . I'm going to check grounds to the alternator then go to pulling fuses and get a multimeter and do a parasitic drain test I guess I don't know really what I'm doing.

 

Youre on the right track with your troubleshooting. Im with AHolt on this one. Let us know what you find.

 

Being that your rig is quite "seasoned", you could have a wire that is chaffed or insulation worn through causing contact with the frame, body, trans, engine etc...
The PITA is finding it. Also, dont rule out the alternator. It could be shorting out inside. Happened to me once, but on a 2000 chevy HD with a gas engine. Just tossing it out there.....

 

I will definitely start by checking the wiring and give you all an update. It was in the shop getting new bushings but now I have it back and can get my hands on it...!! I will check the alternator ground too

 

I figured it out! The plow that was hooked up was drawing power now it starts every morning since I dissconnected it. And by that I mean I took the whole system off

 

Outstanding! Good job bro. Good chance that the plow has the short somewhere.