Replaced alternator and battery on 3500hd and still needs a jump to start

Have the battery load tested to see if it is good or not.

It could be you have a fault in the Diode pack in the alternator you need to get this checked at an alternator repair center.

Hi , you must check wiring from alternator to battery . And replace your battery terminals.

Replace the alternator. Once the battery dies, the alternator should still have a little bit of power left in it, if your car isn't starting after it's been jumped, chances are that the alternator is shorted out. Replace the alternator, and also recharge your battery. Check your battery terminals for signs of corrosion, and clean it off with a scrubbie and a mix of water and baking soda.

It sounds like you have a bad alternator. Be sure to check to make sure your battery connections are tight and clean. If it is your alternator you will need to charge your battery before you run your car after replacing your alternator. You may also have a bad battery but generally if you jump a bad battery your car will stay running as the alternator will keep it running but if you ran your battery dead a simple jump start will not keep the car running if your alternator is bad. Most part stores can test your alternator and battery. Your battery will need to be charged before it can be tested. They do not need to be in the car to test them.

sounds like a bad alternator

sounds like alternator charging output is zero, should run off of alternator output after a jump start, preform a complete charging system check , Battery , Alternator, Cables...Replace as needed...

Thatttttt's alternatorrrrr.

Your alternator charges your battery. No alternator, no battery charge.

Nope, but they are usually near the battery, solenoid or starter (where main service wires are)

Start the car with engine running remove the + battery cable. If engine continues to run alternator is good and battery is probably bad. If engine dies then alternator needs replaced.