I have put a new alternater, belt, and battery in my daughter's 1998 Hyundai Elantra and it still want hold a charge. As soon as we give it a jump then we try to move the car it cuts off. I don't know what else to do unles I have gotten another bad alternater.

Here is the fuse box diagram, but the Elantra appears to have a rather funky battery fuse! Most vehicles have a main battery fuse but it is on the battery connector wire. If you put in a new ECM, was it programmed to the vehicle?

https://www.autozone.com/batteries-starting-and-charging/battery-fuse/hyundai/elantra-gt

Hyundai Elantra (XD; 2000-2006) fuses and relays

Fuse Box Diagrams https://fuse-box.info > hyundai > hyundai-elantra-xd-...

The fuse box is located on the driver's side of the instrument panel behind the cover. The location of the fuses in the passenger compartment: Hyundai Elantra ( ...

Connie,
sounds like ur starter motor is worn out its draining all your power shorting out , the squealing noises is ur belt slipping when ur alternator is trying to charge up battery, & the clicking noise is also starter it 's the soilnoied is trying to work starter,.. first just make sure that all battery cables and chassis cables are clean and tight and chassis to engine are tight , hope this helps get back if necessary Connie

Sounds like it needs a battery.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

yes if the battery is low it will make the alternator work harder and burn it up

Crankshaft position sensor. Ignition coils, broken timing belt, bad ignition switch module,

sounds like your alternater is not fixed. Your car ran off of battery power till you drained it. Complete alternater repair and charge battery. You can check if your alternater works by starting car and disconnect positive cable if it stays running your alternate is fixed. Shut car off and replace positive cable.

Easy you need to loosen the bolts to the altenator then push it so that belt loosen up and then once belt is loose it's easy to diassemble it out...

it sound like your alternater has gone bad. and your trany is bad you will have to replace it

Replace voltage regulator.

It is due for another timing belt replacement.If the belt breaks it can cause damage to engine.I would recommend having replaced as soon as possible