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Numerousssss threads in here on battery replacement. Do a search and pick the latest thread? If memory is good many have used generic size 27F batts. Might even be in the parts spreadsheet found via sticky at the top of this forum. UPDATE in case someone does not read further... knew there...

so the question is.. can one jump 12v in some place too to get her started.... assuming they have an alternator good enough to keep her running afterwords...... or will that not work on this more electronic-ized diesel??

In your opening post as written "dead nothing" and thread title is "Dead Electrical System" thus could easily be interpreted as "dead" is "specific to electrical system"; which is how it read at first to me and why questioned this later for clarity. best of luck on her

is that cause you need 12v to excite the alternator once oil pressure is high enough?

Only enough alternator output to keep engine computer going but not enough for anything else? But then again that would not be "everything" though it may give that appearance? BTW... can't tell from your post if your trying to figure out why it runs after a jump; but nothing else works.. .. or...

You MUST have excitation voltage to the alternator before it will turn on. This only happens above a certain amount of oil pressure. Maybe you can excite the alternator with a seperate jump battery? Sorry do not know if it is 12v or 24v excitation. Think it is 12v. Otherwise would think...