2020 Kenworth T680 ISX15 Starter/Starting Issue?

[Royal J Trucking LLC]

I couldn't find anything on the forums, so I figured I'd ask here.

So yesterday, I started my truck with no problem because I had to move it from the loading zone to where we strap down.

I started with no problem and shut off the truck for about an hour while I secured my load.

I then jumped in and went to start the truck, but there was nothing, as it wouldn't turn over.

There is no sound, not even when trying, no clicking noise or anything.

So, I began going through everything I could think could be this issue.

I checked the battery terminals and voltage; all were tight and had 12.78 Volts.

I hit the starter with a hammer to see if that would work while I had my wife try to turn it over, and nothing.

(There is no sound at all, even when trying.) I checked the IGN, and it seemed to be okay.

I could hear the switch kicking over when I tested it.

I checked the wires to the starter, and nothing was loose.

I checked, and there was power at the starter, and yes, it was still 12.7 volts.

I could pop the clutch while rolling to start it, but the same thing happened again when I shut it off.

So I pop-started it a second time.

I've had to keep the truck on and let it idle, which I hate doing.

I've never let it sit idle for long periods other than when starting up or cooling down after driving for hours.

Tomorrow, I will unload the truck, shut the truck off, and do the starter wire test to bypass the solenoid to see if it starts.

If it does, I don't think it's the starter, possibly just the solenoid.

I don't think it's either because it would at least make a clicking sound when it tries to start.

I don't think it's the ignition switch because I'm not having issues with it turning on dash lights, and it doesn't flicker or cut out like the symptoms say it would if the ignition switch.

So, I'd like suggestions on things I can check and test before buying parts and replacing things that may not be right.

How can I test solenoid?

How do I test stthe arter?

How do I test the ignition switch?

What fuses and relays should I check?

How can I check amps from batteries?

Any suggestions on this would help.

Again, I want to review all of it repeatedly before replacing the starter.

The part that gets me is that it makes no noise and has power.

All lights on the dash work, and everything operates normally, but I get nothing when I try to start.

Sorry for repeating myself, but I want to diagnose this so I can return to work.

I've had anxiety idling my truck, but until I'm unloaded, it's my only option.

Thank you, everyone!

Sent from my iPhone using Tapatalk

 0 Comment(s)

[watersupply189]

Does your truck have a neutral safety switch that’s gone bad?


2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

 0 Comment(s)

[Royal J Trucking LLC]

Does your truck have a neutral safety switch that’s gone bad?


2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

Do you mean one of those clutch switch things?

No, it doesn’t.

I can start the truck without needing to press the clutch.

It just has to be in neutral.

Unless you’re talking about something else.

Either way, I do not need to depress the clutch to start the truck.

Just have to turn the key.


Sent from my iPhone using Tapatalk

 0 Comment(s)

[watersupply189]

Do you mean one of those clutch switch things?

No, it doesn’t.

I can start the truck without needing to press the clutch.

It just has to be in neutral.

Unless you’re talking about something else.

Either way, I do not need to depress the clutch to start the truck.

Just have to turn the key

Sent from my iPhone using Tapatalk

Yeah, I was hoping it could have been something simple for you.

It could be the starter or a solenoid.

You could bump the starter directly from the battery with jumper cables to see if it turns over.

If nothing happens, then it could be a bad starter.

2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

 0 Comment(s)

[Royal J Trucking LLC]

Yeah, I was hoping it could have been something simple for you.

It could be the starter or a solenoid.

You could bump the starter directly from the battery with jumper cables to see if it turns over.

If nothing happens, then it could be a bad starter.

2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

That’s what I plan to try tomorrow once I’m unloaded.

I didn’t want to risk shutting the truck off on a flat surface and being unable to roll it back up.

So I decided I’ll just idle until I’m empty, then I won’t have a shipper on my *** about their load not showing up.

I'm going to try and diagnose again and then go buy the starter if I feel that’s the issue and swap it out.

I hope it’s something simple, but I’m ok if it’s the starter as it’s a simple replacement.


Sent from my iPhone using Tapatalk

 0 Comment(s)

[AK Bob]

I don’t have any specific information on your year/model truck.

I have attached some information for my 2014/3500 that may be helpful.

I will check if the battery voltage drops while trying to start and check the starter feed circuit for voltage drop as described.

Check for battery voltage on the starter solenoid wire at starter while attempting to start.

This will verify the operation of the start relay and power #7 and terminal 87 of the start relay.

(See attached starter diagram).

 0 Comment(s)

[watersupply189]

That’s what I plan to try tomorrow once I’m unloaded.

I didn’t want to risk shutting the truck off on a flat surface and being unable to roll it back up.

So I decided I’ll just idle until I’m empty, then I won’t have a shipper on my *** about their load not showing up.

I'm going to try and diagnose again and then go buy the starter if I feel that’s the issue and swap it out.

I hope it’s something simple, but I’m ok if it’s the starter as it’s a simple replacement.


Sent from my iPhone using Tapatalk

Any update on your rig?


2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

 0 Comment(s)

[Royal J Trucking LLC]

Any update on your rig?

2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

It’s the starter.

After I unloaded, I went to a Loves and parked.

I shut it off after 48 hours, and it still didn’t start.

Did the wire test from + to the spot on the solenoid that’ll bypass and start it up.

Nothing, it just clicked. I headed to Kenworth to get a new starter.

I was undecided if I go OEM or Delco Remy, but based on what I’ve read and a mechanic suggestion to go OEM, that’s what im going to grab.

Although it is a bit more $$.

Have you guys ever used Delco Remy?

Or do you buy OEM? (Paccar for my truck).


Sent from my iPhone using Tapatalk

 0 Comment(s)

[AK Bob]

I would also recommend the OEM starter.

 0 Comment(s)

[watersupply189]

It’s the starter.

After I unloaded, I went to a Loves and parked.

I shut it off after 48 hours, and it still didn’t start.

Did the wire test from + to the spot on the solenoid that’ll bypass and start it up.

Nothing, it just clicked. I headed to Kenworth to get a new starter.

I was undecided if I go OEM or Delco Remy, but based on what I’ve read and a mechanic suggestion to go OEM, that’s what im going to grab.

Although it is a bit more $$.

Have you guys ever used Delco Remy?

Or do you buy OEM? (Paccar for my truck).


Sent from my iPhone using Tapatalk

I figured it was probably a starter issue.

OEM is the way to go.

2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

 0 Comment(s)