I have a 95 2500 cummins that sometimes wont start!

Carlos, Check change fuel filters and bleed fuel system.
below are links to helpful information
1993 5 9 won start Dodge Cummins Diesel Forum

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwjUuu_J9_XKAhXKkx4KHfnBAsIQFghDMAM&url=http%3A%2F%2Fwww.dieselbombers.com%2Fdiesel-distress-support-ticket%2F30662-need-your-expertise-5-9-cummins-wont-start.html&usg=AFQjCNGPEHGbGP89d63Br96hwF3OJ44w8A

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwj8-Knn9_XKAhXHLB4KHUw1APIQFgghMAE&url=http%3A%2F%2Fwww.cumminsforum.com%2Fforum%2F94-98-powertrain%2F537237-cummins-wont-start.html&usg=AFQjCNEIvu0enlWiJQkgi5EYwpLisdMMrg&bvm=bv.114195076,d.dmo

Dodge Ram 2500 Questions Won start CarGurus

Does it not turn over or it turns over but wont start?
If it will not turn over I would check the ignition switch for loose connection. If it turns over but wont start check the fuel pump relay.

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if you have not changed the camshaft position sensor you need to do that sounds exactly like my problem got the new fuel pump and filter in there and it was fine for a month then same thing started happening again, been fine for 7 months since I changed my camshaft position sensor

On one of the occasions when it won't start back up, someone will need to figure out if you have lost spark to the plugs or fuel to the injectors to be able to troubleshoot the problem.

Well, This sounds more like the starter may need a rebuild than anything else....The symptoms are there! The loud clicking is the solenoid (normal), and it should turn the engine over and crank at that point without you hearing the clicking. Since it does not crank, all you hear is the clicking..
There is an old "red neck" trick that could define your problem...When it just gives you "part one" and doesn't turn the engine over - STOP - NOW..crawl under the truck and try several taps on the starter frame ( NOT ON THE ROUND HOUSING ) with a metal hammer, now see if it starts right up...if this works, then the starter brushes are on their last bit of contact...AND this usually only works once or twice then its time for a rebuild...(don't ask how I know this works!!)
..If this works for you, then you have diagnosed your issue. Even if it doesn't work, my money is still on the starter!! Good luck...

Hi, a couple things you can check are the alternator voltage and the battery terminals. If a car starts with a jump but not with the battery, either the battery is low or the terminals are not tight enough. A low battery can be caused by a failing alternator. With the car running, the voltage at the battery should be at least 14 volts. If not, or you don't have a voltmeter, remove the alternator and have it tested at you local parts chain. Let me know if you have more questions and thanks for using FixYa.

double chek vacuum lines first..or O2 sensor if you have one...

Pull the vaccuum hose off of the regulator. If wet fuel is present, the regulator diaphram is bad.......replace the regulator.

passive anti theft..you can get it bypassed withe dei. module if you have a good install shop (stereo alarm installer)

I had the same problem, there was a short in the shifter wire.