My 1999 mitsubishi diamante will not start. I got a friend to jump it but it still would not start. I took the battery out and took it to autozone to charge it. But autozone would not charge it because they said it was swollen probably from the alternator pulling on it. So I bought a new battery thinking that might be the problem, and it still will not start. Do I need a new alternator or a starter?

copy and paste

https://www.autozone.com/diy/repair-guides/mitsubishi-car-1999-05-removal-and-installation-repair-guide-p-0996b43f8037e77c

Your 1999 Mitsubishi Diamante is a 3.5L MFI SOHC 6cyl engine.
MFI = multi-port fuel injection
SOHC = single overhead camshaft
This answer covers Mitsubishi Diamante1.8L, 2.4L, 3.0L (SOHC and DOHC), 3.5L, and 1997-2000 1.5L Engines.

2.4L engine shown, others similar.

Fig.1 - CKP position and its two mounting bolts


In Fig. 1, the two arrows point to the CKP (crankshaft position sensor) mounting bolts to remove. 2.4L engine shown.

Fig.2 - CKP reluctor removal

Remove the sensor and slide the reluctor wheel off of the crankshaft-2.4L engine shown.

1. Disconnect the negative battery cable.
2. Remove the timing belt.
3. Unplug the sensor connector.
4. Unfasten the two retaining bolts, then remove the CKP sensor from the vehicle.
5. Installation is the reverse of the removal procedure.

Reference: Autozone online repair guide: Mitsubishi Galant/Mirage/Diamante 1990-2000, at
www.autozone.com

Fig.3 - photo - new 99Diamante CKP, a Wells part #SU4313

run the fault codes
check that the cam shaft is turning (broken timing belt)
check immobiliser for correct operation---flat fob battery

Bad ignition switch or bad ground to the battery.

alternator,take to autozone to test.

Charge it all the way up. Then take it to a auto parts store and get the battery and starter and alternator tested.

You have bad terminal..open the battry terminals pour some boiling water over them. then use a sand paper to clean then when ur done doing so install the terminal and put some grease ove them a bit not too much. and tight it well i think it will be ok then.

Assuming power is getting to the starter fine I'd have to guess the starter is worn and may require replacement. I'd investigate the starter motor.
I hope this may have helped,
Tom

The firing order is 1-2-3-4-5-6

The rotor spins counter clockwise and bottom of the distributor cap is the number one spark plug lead.

For more details, you can check the information about Mitsubishi Galant/Mirage/Diamante 1990-2000 FIRING ORDERS in Autozone.com (free register).

Hope this helps.

REPLACE ALTERNATOR.