Hey. I'm new to the forum and to owning a diesel. I have worked on them before and would say I'm mechanically inclined. I have very recently bought a 1995 f250 that i thought was a good deal. It is automatic, 4x4, regular cab with 245xxx miles. Has had transmission/transfer case rebuilt within last 10,000 miles and new injectors about 15,000 miles ago. Also has a TS 6 position chip. Have most receipts and some maintenance records. In the past week i have put on quite a few parts which include new batteries, glow plug relay, idler pulley, starter. After I installed those parts the truck was up and running. It started cold at 15* first hit. I drove it for a day or so perfect. I probably started it 10 times. Then my cousin broke the ignition switch not the lock cylinder. I guess he turned to hard. Installed a new one and now the truck will crank but no wait to start light, and a check engine light has come on. Here's what I have checked:
checked all fuses and relays 4 times with voltmeter
Tried to jump the GPR, no good
made sure i was getting a good battery connection
reinstalled the old ingnition switch, same thing as new one
Unplugged the fuel bowl heater, maybe causing a short

I have smoke coming out of the exhaust back pressure valve. I didn't want to crank to much or maybe it would have come out of the exhaust but i cranked it probably about 5 times over a few times. When i crank im getting RPMs. Its like the PCM is burned out or wont work. I also have dash lights that stay on when the key is off like the check engine light and the battery light. I need help please. I tried to be as detailed as possible. Please give me any feedback. THANKS.

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Nothing??? Any Input is helpful.

 

At the passenger side fender, rearward of the battery is a starter relay. Off that, check fusible links "C" and "D". Both are dark green. At the engine service box at the drivers side fender well, check maxi-fuse #22 (30A). All three of those go to different points, supplying power to the glow plug relay. Maxi-fuse #22 also supplies the fuel heater.

Also check maxi fuses #9, 15 and 17... Those maxi-fuses are on the battery circuit side feed to the ignition switch... supplying power to the ignition switch. Maxi fuse #9 is also the main power into the PCM. Maxi fuse #8 is the main power to the Injector Drive Module (IDM).

 

I already checked all the fuses in the box under the hood many times with a light and voltmeter. I will check the fusable links though on the passenger side.

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Now I have no RPMs either

 

From what you described, the next places to check would be the Starter and Glow Plug Relays. But with no RPM's on the Tach while cranking, I would replace the CPS... That is what is does (doesn't do) when that goes south.

 

New starter and GPR. It will crank. The GPR is getting no ground from the PCM. I cant even jump it.