Jump to content
  • Welcome To Mopar1973Man.Com

    We can see that your guest and been lurking about. When you register on the Mopar1973Man.Com site you'll be able to interact with all the other members. This is the most friendliest Cummins forum you'll ever join. Take the time right now and  REGISTER  on the Mopar1973Man.Com this will open up many more options and functions on the website. Everyone is very friendly and helpful just ask questions and everyone will help you out the best they can. 

Recommended Posts

Damn was getting ready to do the WT ground mod and noticed the upper mount tab is broken on my Alternator.  It's a bosch.

 

Are the bosch and denso alternators interchangeable?  I've been shopping around for a replacement but seems to  be some confusion about the correct alternator, depending on the eighth digit of the vin. ( in my case it's "C")

 

Advance auto has the actual bosch alternator (based on the alternator part#) but the listing says it's for trucks with a vin: 7 https://shop.advanceautoparts.com/p/bosch-premium-100-remanufactured-alternator-al6400x/20851271-P?navigationPath=L1*14920|L2*14999|L3*15587

 

Rock auto has an alternator for vin: C, the listing says its a bosch, but the pictures are denso.  https://www.rockauto.com/en/moreinfo.php?pk=5778228&jsn=3

 

Rock auto also has an alternator for vin: 7 and the pictures of it are bosch:  https://www.rockauto.com/en/moreinfo.php?pk=273175&cc=1441320&jsn=2096&jsn=2096

 

I called a dodge dealer, they said item is discontinued but at least gave me the part# 5104772AA  BUT a google search of that number brings up a denso alternator.

 

A search of the actual part number on my alternator brings up a bosch:  0124525005

 

Which one should I use?  Why is it everyone says my truck vin: "C" should be denso, but my truck has a bosch?  Ok so there is a chrysler emblem on my bosch alternator, but who's to guess if it's the original factory alternator. Sure is old and beat up looking regardless.

 

 

While I was in there I noticed the large positive cable that connects to the alternator (B+)? was rubbing against the top of the alternator body, wire insulation partially worn through. Glad I caught that before shorting out.  Pictures:

 

 

 

 

 

 

 

alternator bracket.png

alternator wire.png

bosch alternator3.jpg

Link to post
Share on other sites
  • Administrator

Interchangable. 

 

Bosch and ND alternators will both fit. I just had this happen on my landlords truck at my other shop. Did the W-T ground wire and pulled the alternator and the nut broke off the top bracket. 

  • Like 1
Link to post
Share on other sites

Personally, I would not be that concerned about the broken ear on the alternator.  There is still plenty of material left on the ear to allow for a good clamp.  The reason the mounting ear failed is because the clamping fastener had lost its tension a long time ago.  Once the tension was lost, the fastener beat against the mounting ear relentlessly at the frequency of the running Cummins engine. 

 

As long as there are no cracks in the remaining part of the ear mount, I would re-use the alternator.  Just check periodically that the fastener remains tight. 

 

- John

Edited by Tractorman
always something
Link to post
Share on other sites

I'm replacing this alternator and the mounting bolt.  Who knows how many miles it has on it anyway. Could be 230k if it's the factory unit. Getting ready to haul a car trailer next month, can't take chances.

 

Looks like it's been bouncing around for a while, the bolt is worn quite a bit:

 

 

 

 

alternatorbolt.jpg

Link to post
Share on other sites
10 hours ago, dripley said:

We have twins.

Good one! I guess it's not a coincidence then.  @dripley how many miles were on your truck when this happend?

 

I'll be checking this more often, like every oil change. I'll see if I can scribe a mark on the mount bracket for future reference to observe if the alternator body is moving position.

 

Good bet there are other trucks out there with this issue without knowing it. Might be worth pulling the bolt to inspect & replace if worn.

Link to post
Share on other sites
1 hour ago, Ironforger said:

Good one! I guess it's not a coincidence then.  @dripley how many miles were on your truck when this happend?

 

I'll be checking this more often, like every oil change. I'll see if I can scribe a mark on the mount bracket for future reference to observe if the alternator body is moving position.

 

Good bet there are other trucks out there with this issue without knowing it. Might be worth pulling the bolt to inspect & replace if worn.

About 260k. Never had that happen one before or since.

Link to post
Share on other sites

340,000 on original alternator and no issues, BUT very early in its life that very bolt was loose.  I tightened it and it never loosened again.  That bolt has to be tightened to the point of distorting the ears on the mounting bracket enough to actually make them clamp onto the mounting ear on the alternator.  I think that is why some fail and some don't. 

 

@Dieselfuture is correct... you had better eat your Wheaties first.

 

- John

Edited by Tractorman
  • Thanks 2
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...