Starter?

[DH9185]

I have a no start condition in my '20 hemi. Starter doesn't crank. All I get is a humming noise that won't stop until I disconnect the battery. Battery has a full charge. Any ideas?

 

[NCRaineman]

If the battery is good the starter would be my next suspect, yes.

 

[RamDiver]

If the battery is good the starter would be my next suspect, yes.

Or, possibly the battery connections/battery feed wire to the starter.

Start with cleaning the battery posts and clamps, then a load test using something like this $20 device from HarbourFreight. The digital battery load testers are notorious for false positives when you have a flakey cell.

100 Amp, 6/12V Battery Load Tester

Amazing deals on this 100 Amp 6/12V Battery Load Tester at Harbor Freight. Quality tools & low prices.

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Batteries fail from new so, age is irrelevant.

If you're measuring 12.8 VDC on the battery terminals, what is the measurement on the bus wire at the starter?

.

 

[DH9185]

Ok, I've never had one go into a hum that persisted until I disconnected the battery. Strange.

 

[turkeybird56]

Bad starter/Bad starter relay????? Relay once engaged will not disconnect? Hmmmmmmm.....

WHERE is the humming coming from??? That info needed.

 

[DH9185]

Battery area. Sounds like the battery is stuck in feeding mode. If I don't disconnect it soon I begin getting a hot smell.

 

[turkeybird56]

Battery in feeding mode? Not quite sure what That is. "sounds" like Starter is not turning, maybe bendix bad, jammed and/or starter relay is open pushing power towards starter, circuit not closing. Bet you feel battery cable that goes to TIPM, I think Wild said that is Pin 13, it will feel real warm and/or hot.

@Wild one
What you think, you are better at this stuff than I am. I am just trying to think outside the box, Internet Guessnosis can be a biotch, lol.

OP: U need to get it into a shop/competent mechanic to check/diagnose and repair. I would not leave that system energized pushing that power to where ever. U might start that engine bay on fire, just saying. Really sounds like an inop starter/bad relay or both.

F40 is the Starter Fuse. K06 and K09 are starter relays. But you have a problem needs professional diagnosis.

OP: Look at your external fuse box, under cover, and there is a diagram printed under the cover and lists which relays/fuses go to what.

 

[Wild one]

Battery area. Sounds like the battery is stuck in feeding mode. If I don't disconnect it soon I begin getting a hot smell.

Pull the starter relay and jump the terminals,if the starter works properly,then it's probably a bad relay.
Lots of video's on youtube that'll help you out

Dodge RAM 1500 Starter Relay and Fuse

Using a 2014 Dodge Ram 1500 I point out the location of the starter relay and the starter fuse.

www.youtube.com

Symptoms of a Bad Starter Relay and How to Test If it Has Failed

Symptoms of a starter relay gone bad and how to tell If it has failed. How to Test a Start Relay Video: https://youtu.be/uHMfP7Wd6WMWhat is a Starter Relay?A...

www.youtube.com

2011 Dodge Ram 1500 Starter Relay, Starter Fuses & Troubleshooting

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

www.youtube.com

 

[RamDiver]

Battery area. Sounds like the battery is stuck in feeding mode. If I don't disconnect it soon I begin getting a hot smell.

This is a great tool to have and won't break the bank.

https://www.princessauto.com/en/mechanics-stethoscope/category/330-010-005-045

Amazon.com

For decades, I've had a mechanic's stethoscope like the $5 one below. It works great, but I'd like to extend its reach to about twice the distance. I'd prefer to not hang headfirst into the engine bay.

I've been eyeing up steel rods at CTC for the task but until that gets completed, a wooden broom handle does the job.

Amazon.com: Garnish Gripper Mechanic's Stethoscope Automotive Engine Diagnostic Sensitive Hearing Tool for Cars, Trucks and Motorcycles,Black : Automotive

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If you don't have one of the above, a large screwdriver with a large soft handle will suffice.

Touch various areas around the noise that aren't energized with voltage, you should be able to narrow down exactly where the source of the noise is.

I should also have mentioned, press the handle against your ear while touching the tip against different components or devices like the starter.

The screwdriver pressed against your ear the amplify the noise and help you to identify the exact source.

Most definitely, do not leave the battery connected for any extended periods or whenever you're not standing in front of the truck.

If the battery is working well and you apply a dead short from a faulty starter, a fire or battery explosion is possible. You may want to wear safety goggles and pass this off to a professional if you don't identify the fault sooner rather than later.

.

 

[turkeybird56]

Pull the starter relay and jump the terminals,if the starter works properly,then it's probably a bad relay.
Lots of video's on youtube that'll help you out

Dodge RAM 1500 Starter Relay and Fuse

Using a 2014 Dodge Ram 1500 I point out the location of the starter relay and the starter fuse.

www.youtube.com

Symptoms of a Bad Starter Relay and How to Test If it Has Failed

Symptoms of a starter relay gone bad and how to tell If it has failed. How to Test a Start Relay Video: https://youtu.be/uHMfP7Wd6WMWhat is a Starter Relay?A...

www.youtube.com

2011 Dodge Ram 1500 Starter Relay, Starter Fuses & Troubleshooting

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

www.youtube.com

On MY 19, shows (2) relays as starter relays, K06 and K09. Also F40 as Mcase 40 AMP. OP has a 2020, should be the same as my 19.

 

[Wild one]

On MY 19, shows (2) relays as starter relays, K06 and K09. Also F40 as Mcase 40 AMP. OP has a 2020, should be the same as my 19.

I'm not familiar with the 5th gens fusebox or relays,but i'm guessing one of them is the actual starter relay,lol

 

[turkeybird56]

I'm not familiar with the 5th gens fusebox or relays,but i'm guessing one of them is the actual starter relay,lol

YUP, just not know why they list 2, lol.

@Wild one.

See attached, here is my fuse box and info from Distro Case Top. I have both the starter 01 and starter 02 relays and 40 amp fuse. IF I was OP, I would buy both relays and replace. They are not that expensive. He also needs to check the 40 AMP case fuse. But if that not work, needs to go to a good mechanic. My thought is: if a relay went bad and was supplying constant power to starter, may have fried the starter too. But unable to diagnose on Internet Guessnosis. Now my truck is a 2019, No E Torque. IF OP has E Torque, he may have some more fuses and whateva may be associated with the E Torque and/or stop-stop if OP has that also.

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[DH9185]

Are those the K10 and K11?

 

[Wild one]

Are those the K10 and K11?

K06/K09

 

[RedcardRam]

Pull the starter relay and jump the terminals,if the starter works properly,then it's probably a bad relay.
Lots of video's on youtube that'll help you out

Dodge RAM 1500 Starter Relay and Fuse

Using a 2014 Dodge Ram 1500 I point out the location of the starter relay and the starter fuse.

www.youtube.com

Symptoms of a Bad Starter Relay and How to Test If it Has Failed

Symptoms of a starter relay gone bad and how to tell If it has failed. How to Test a Start Relay Video: https://youtu.be/uHMfP7Wd6WMWhat is a Starter Relay?A...

www.youtube.com

2011 Dodge Ram 1500 Starter Relay, Starter Fuses & Troubleshooting

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

www.youtube.com

Wild one has it.
It's a bad relay most likely, bendex not engaging is possible if the humming is by the starter.
You can try tapping on the side of the starter with screwdriver handle to free up the bendex....just becareful

 

[Tominator223]

Possible bad ground. Or relay. You can swap the relay with a matching relay from fb. That will give you a quick answer.

 

[Marshall]

If you are getting a hum, heat in there, then it's likely the replay points are stuck / welded together from too much current draw as a rule. you could check with a ohm meter, if you knew which pins where the contacts. they are easy to check with jumper wires and a battery.
easy way is just stick in other ones a try it , if nothing happens, then put a volt metre on the main starter post, and if it has 12V when trying to start, them pull the starter and check/ replace. If the points are welded, you will have 12v on the starter when you are not trying to start the truck.
Pull those 2 cck brakers, 6 and9 with the battery hooked up and you will be able to tell is they are shorted or not by the sound., plus it will be hot.

BTW ,I never tap a starter, I hit the damn thing .