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1995 f-350 one ton dually, 460/7.5 EFI , installed new battery, re-man'ed alternator, Bosch, ( direct replacement with what it had) E4OD transmission. The list of issues goes on and on but-!, While I was running a scanner on it ( PO 138,139 and 158- all O 2 sensor related) I got curious and ran a DVOM on the battery because, the in dash battery indicator, such as it is, went from 14 or so volts now down to the point of not even turning the engine over at all. The DVOM went from 13.9 and continued on a downhill slide until it got to about 8.5 and then it shut off. Now, the only thing I can think of in the charging system is, Battery, Alternator and possibly the voltage regulator, which, if memory serves me correctly since this is a ( I think) type B system, ( VR is within the Alt.) something else is going on and I'm just stumped. I've walked through the electrical diagrams and I'm just not seeing the obvious ( or I need to get new glasses ). Some where in this mess has to be an easy answer but I will be hanged if I can figure this out. Any suggestions? the guy I got this from was less than honest and I won't even begin to go through that lists of issues just yet. But I do know he did say there was a draw on the battery, thus the reason why he kept the battery disconnected. I'm at a total loss.