Car wont start after replacing alternator and battery is new what could be wrong?

battery is now dead SURE. (OR WAS THE REAL PROBLEM)
and removing the ALT DONE WRONG
STEP 1, PULL NEG BATTERY LUG FIRST
RESULTS IN BLOWING UP THE 100AMP ALTERNATOR FUSE
THAT CAUSED 10 NEW ALTERNATORS NOW BORN DEAD
OR IN TRUTH OFF LINE .
NEXT TIME ASK HOW FIRST AND THEN LEAP OR READ THE SERVICE, MANUAL
STEP 1 IS JUMP START THE CAR WITH JUMPER CABLES
AND THE BOX OF CABLES TOLD YOU HOW.

READ

https://eautorepair.net/Marketing/Default.asp

Interesting,this sounds just like no output from the alternator. If the alternator is good then it has to be the cabling or connections to the battery. If you have a multimeter take a reading on the cabling then read what is actually reaching the battery posts.

excessive power loss due to alternator bad..take to parts store so they can check it..diode trio is bad letting power back thru the alternator..basically it wont shut off now and will kill the battery after several hours..

will engine crank?? if not, recheck battery cable connections. if vehicle ran until shut off, tells me that your charging system kept vehicle running until vehicle was shut off. alternator light can be related to faulty alternator and or bad battery.

You probably have a battery drain from a defect. circuit. Just put a test light between the ground of the battery and the ground cable. If you have a drain problem, the light will go on. Then you remove the fuses one by one until the light goes out to isolate the circuit. A electrical wiring diagram will be appreciated. I would say it is the installers fault and that the alternator is probably working fine, but the alternator is either hooked up wrong or has a broke wiring harness or the belt is under driven or this is the wrong alternator for your vehicle. or the best answer is you have a short somewhere causing the charge from the alternator to not reach the battery. In other words the pathway is broken. There can only be a few answers to this question. Something is broken/loose(wiring) /installed wrong/or the wrong part. Try the z net from autozone. It will give step by step instructions. You need to include further information of the vehicle(year/make/model/size engine/ if you want specific informationPull the pos strap off of the battery when the car is running, if it dies and you know that the alternator is good you could have a short. That could be what is killing your batteries.

Is your car killing batteries overnight? Could have a short somewhere else and that short just put more strain on your alternator.one way to see is to start car with nothing on in the car an remove hot lead from battery car should stay running if it do turn head lights on car should die Resistance in the wiring due to corrosion or poor ground. Sometimes theres a regulator that controls the voltage and amps within the alternator that is defective

Thanks for choosing FixYa and welcome. You need to make sure the battery is holding a proper charge. Clean the terminals and clean the post. You could have a weak alternator draining your battery. You can test it by starting the car and unplugging the hot side battery terminal once the battery is charged. If it dies instantly, your alternator is bad. You may need a new battery.

Wow. exact same problem im having. Just had battery and alternator tested.

take to a local rebuilder most likely starter common honda problem

The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!

Sounds like an alternator. When it goes bad, your car is forced to run off of the battery , which wont last long depending on what all you have running .
The alternator keeps your battery charged after your car starts.
Try replacing the alternator and let me know if you have any more problems.