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I have a 2010 dodge challenger rt 5.7
We changed alternator because it died on me and gauges went crazy.
New alternator was put on ,car starts but Voltage is low when testing on battery. Husband unhooked negative on battery and car dies.
Is new alternator bad or is it something else?
Any help appreciated
 

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there might be issues with the TIPM (power module in engine bay) - it could have damaged it. There are fused circuits built into that are not serviceable.

the TIPM has everything for the electrical system going through it
 

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2018 Dodge Challenger T/A Plus in Yellow Jacket w/5.7L and A8 automatic
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Have the battery properly load tested somewhere.
 

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You can't unhook the negative battery cable like you could in the old days. Is it an auto parts remain alternator. Is it is go swap it out? Parts stores reman# are hit or miss on being good.
 

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2012 Charger Pursuit
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I have a 2010 dodge challenger rt 5.7
We changed alternator because it died on me and gauges went crazy.
Was this alternator tested to confirm?

New alternator was put on ,
Where was the new alternator source from, a local auto parts store, the dealership, etc.?

What brand was it?

New or remanufactured?

car starts but Voltage is low when testing on battery.
What is the voltage reading on the battery posts while engine is idling?

Does the reading change if measured on the cables attached to those posts?

Does it change if measured at jump posts in engine bay?

What is the voltage reading with engine at 2K RPM and major accessories on?

Does the red battery light on the EVIC illuminate at any time after the engine is started?

Husband unhooked negative on battery and car dies.
This method of testing is incompatible with modern electrical systems. Using it puts the rest of the system in danger of over voltage spikes, and it should be avoided in the future.

Is new alternator bad or is it something else?
Any help appreciated
This is the sort of issue that is exceedingly difficult to diagnose over the internet. Your best bet is to test for every possible scenario of breakage or damages parts. There are literally dozens of possibilities.

For example, was the serpentine belt installed correctly upon alternator installation?

That’s certainly not a common cause to your symptoms, but it’s not unheard of either.
 
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