I have a 99 cummins 3500 with an edge ez and it wont start. all the gauges are good and the battery is a 12. it'll start sometimes and sometimes it wont. The batteries an alternator is brand new and the starter checked out good. its not throwin any codes just wont turn over. Any help at all would be great thanks.

 

If the problem is that the starter won't crank, the first step I would take would be to replace the contacts in the starter. Quite possible that they are worn just to the point where sometimes they will work and sometimes they won't.

Welcome to the site.

 

starter contacts or ignition lock cylinder needs to be replace

 

Which is it?

Won't start (fuel) or Won't turn over (electrical).

 

Copenhagenjunkie
Its electrical. It wont turn over but will start if you roll it.

 

Just a note, I'm not a mechanic by any means but yesturay my 99 cummins would not start. Guages and wait to start would turn on but as soon as I turned it over it would shut off everything. I'd have to wait about 3 minutes or so for any type of power to be restored to the guages. I charge both batteries ( I did not and do not think they needed it but I did it anyway). When I tried it tonight, SAME THING, she would not start. 2nd attempt 5 minutes later, I watched my batteries through the bottom of my hood as I turned the ignition on and WAHLAA, Sparks a flying. It starte but looks like the sparkes were coming from a little corosion around the batterie temperature cables. Thought you might want to check yours out.

 

If starter contacts are ok then look at:
Neutral/clutch safety switch on manual
Park safety switch on auto

 

Well we took it to our mechanic and he's puttin new fuel filters and a starter on it so well see what happens now. Thanks for the replies. Im new to the forum, but it is really handy cause im truck dumb. This is my first truck and its caused me nothin but trouble cause its set for 4 yrs and was barely drove till my dad gave it to me. thanks again for the replies.

 

Alright, Im new here, and bring a little knowledge to this problem but am still looking for a reason for the same problem
My truck will not crank but will start if rolled
The problem i found was that i am blowing the start relay fuse in the fuse box behind the driver's side battery
it may be a short in a wire or a short somewhere in the windings of the starter solenoid i dont know yet

 

Have the batts load checked separately. Make sure all connections are clean/tight to the batt and starter. If it won't crank it's either bad batt or starter contacts. Aftermarket starters will go bad due to the cheap/small contacts installed. If these are good then trace the wires back looking for a short.