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Alternator not charging: Getting Hot!

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1999 dodge 2500 Auto

new batteries

Grid heater deleted

Everything else pretty much stock

 

I replaced my alternator in preparation for getting my ECM rebuild. Installed my rebuilt alternator after they replaced the brushes, diodes and rectifier. 

Started the truck. No charge. Alternator got very hot.

Went and got a brand new alternator.. Same thing.. 

 

I am looking for help!! Where to start trouble shooting. Hoping the PCM isn't fried too! 

 

I am headed to the store tomorrow to buy a new multimeter, mine broke recently, to check the green wire coming off the alternator. Im more worried there is a short somewhere in the wiring.

 

Any help would be appreciated!!!

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  • Tractorman
    Tractorman

    @mbloom65, I would be looking for something that might have happened when you changed out the original alternator, since it was working fine.  Something as simple as a poor ground like @JAG1 suggests

  • Mopar1973Man
    Mopar1973Man

    So...   Need to test the green and blue field leads quick.    BLUE field lead - Just unplug from the rear of the alternator and start the engine. Red Probe goes to blue wire and Bl

  • Dieselfuture
    Dieselfuture

    Where is it from,  parts store? It can be junk new, I'd get an original denso one online or nations for more money. Put your original rebuilt one on and do the 5amp fuse mode like @Tractorman mentione

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  • Owner
5 hours ago, JAG1 said:

Don'trust old batteries everyone and an alternator can develop an internal short and get hot that way too so that 5 amp fuse on the blue wire is important.

 

Highly important... He's completely right. It would be best to replace the batteries (or at least tested) then replace the alternator make sure to test it before paying for the alternator. Make sure all the battery terminals are good and clean. That 5A fuse is very important to protecting the PCM.

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