If the 3.9 is a magnum 3.9, find a donor truck to get the computer, harness, and any other little parts for the swap. Then your going to need wiring diagrams for the donor system and for your 06. This will get the engine to start, you will have to look further into the wiring to see about the...
It could be a bad oil pressure sensor. You need to have the oil pressure checked with a mechanical gauge. If the oil pressure sensor connector is full of oil the sensor is bad
You can use a multimeter to check for battery draw, use the 10 amp side and connect the meter between the battery and either cable. Start pulling fuses if you have a draw as indicated by the meter, if the fuses don't make any difference, disconnect the alt and voltage regulator. Do one fuse at a...
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