I have a 99 dodge ram sport 4wd 5.9 it wont start. I have full power turn the key nothing.replaced starter,battery,power wire,starter relay,neutral safety switch and checked ignition switch still nothing have any idea's?
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Could be a loose connection at your battery, check the battery terminals, trace battery leads to there ending locations for loose connections. check all fuses, or at the worst, your starter switch. 85% sure its starter switch pictured below.
it could be the ani theft system or the starter, go for the starter check the small wire while someone turns the key for you, see if there is power there using a 12 volt test light if so then suspect the starter try hitting it with a hammer if it starts then for sure it is the starter.
1. Unhook the battery 2. Raise and support the truck on jack stands. 3. The starter is located on the drivers side at the front of the tranny. 4. Grab an 8mm and a 13mm wrench. 5. Remove the power wires from the starter. 6. Remove the starter by removing the top bolt 9/16 i believe and the bottom nut. Also 9/16 or 5/8. 7. Carefully slide it out toward the front of the engine. 8. Installation is the same as removal.
Did you check to see if there is power to the glow plugs if not then that may be the problem and if there is power when you cycle the key not to start but for the plugs to warm up you may have a bad glow plugs.
I had a similar problem and believe it or not it was the CAT. An easy way to test for this is to remove the O2 sensor right in front of the CAT. Once you removed it, plug it back in while unscrewed from the exhaust pipe and start up the truck. If it runs fine, the CAT is your problem. This is just a guess and it would be an easy and very cheap($0) test. You did not say if the truck was diesel or gas. Mine is gas that was exhibiting the same problem as yours...good luck!