Replaced battery and truck still won’t start.

My sister's truck won't start. We tried boosting the truck, but the battery won't charge. Even after putting in a new battery, the truck won't start.
Experienced mechanics share their insights in answering this question :
Hi there. This can be caused by a number of things depending on what the vehicle does when you try starting it. If it does not crank at all or make any noise then you may have a bad battery cable or a failing starter. If the engine is cranking over and it is just not starting then you may have a fuel system issue or maybe a bad coil. You should enlist the help of a certified mechanic, like one from YourMechanic, who can thoroughly inspect your truck’s starting system.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

When you have a brand-new battery but still can`t start the car, the alternator might be the issue. Cold and damp climates may increase wear on an alternator, causing it to fail. Flickering gauges and a burning rubber smell could indicate that the alternator overheated and requires replacement.
If your vehicle won`t start, it`s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter. It can be hard to determine if you`re dealing with a battery or an alternator problem.
So you just replaced your car battery. Start by driving the car for about 20 to 30 minutes, then reprogram your radio presets. , drive the car for about 20 to 30 minutes to reset the computer and charge the new battery before reprogramming your radio and anti-theft systems.
Bad starter motor: If you hear a single click when you turn the key, but the engine won`t start, that could mean there`s a problem with the electrical system. The starter motor is responsible for physically turning the engine over and getting the engine to fire. If this is the issue, you`ll need a new one installed.
Bad Spark Plug Or Broken Distributor Cap/Rotor

If you have a good battery and enough fuel in the gas tank and your car still won`t start, chances are you have a bad spark plug. Why? A bad spark plug will prevent fuel ignition, and the vehicle won`t move.

If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
Under normal circumstances, you don`t need to do anything else other than keep driving the car after resetting the computer. The ECU will eventually relearn its ideal settings and reprogram itself with use.
The new battery does not have to be configured for the most current car models. Banner conclusion: No registration required; a check of the electrical functions after changing the battery is recommended.
The battery can be fully charged but still not be able to start the vehicle if it is failing or has a dead cell. Other likely issues are the fuel pump, ignition switch, battery cables, starter, or a clogged fuel filter.
A bad battery won`t usually harm your starter or alternator, however, since both of those components get their voltage directly from the battery, if the battery is underperforming, both the alternator`s and starter`s performance will be affected as well.
When you attempt to start the vehicle, is there a clicking sound, but it won`t turn over? That may be a good sign. If a jump gets the car running, but won`t turn over again once it`s shut off, a dead battery is likely the cause.
It is possible that the problems that you have been experiencing with the bad alternators have damaged the battery causing it to be weak. This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.
Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.
A Bad Crankshaft Position Sensor

The crankshaft position sensor monitors the position and rotational speeds of the crankshaft. Without the crank sensor, the engine control module (ECM) wouldn`t know when to fire the fuel injectors and ignite the spark plugs.

The starter relay is one of the most critical and often overlooked components in any vehicle ignition system. The starting relay is a small electrical device located in the starting circuit of a large current motor. The relay is just a remote control switch that regulates the current in a high-current circuit.
The easiest way to perform an ECU reset is by removing the fuse from the fuse box. It is a very simple process, and all you have to do is pull out the car key, remove the fuse from the fuse box, and then put it back after about 15 to 20 seconds. Doing this clears any long-term memory stored in the car`s ECU.
ECU re-programming is not required because most repairs are done on the hardware parts and not on the software programming. Therefore, the programming of the ECU will never be altered.
The ECU retains its memory even after the battery has been disconnected and reconnected. On older cars with CCC simply disconnecting battery for a few seconds and reconnecting it will be sufficient to clear the code.
Some warning signs of a failing alternator include: Trouble starting your car. Frequent stalling. Whining or screeching noise after the vehicle starts.
An early warning sign that your alternator is going bad could be dim, flickering lights. This symptom could show up on any or all of your dashboard lights, reading lights, headlights or other lights. The alternator is supposed to provide the electricity for your car`s lights.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Fuel pump engages. Batery good, alternator good volts, jump start helps when wont start. Temp does not matter. Intermittent?
ANSWER : Hello. Thank you for writing in. There are several reasons your vehicle may only start when jump starting. The first and most common is a build up of resistance that is causing you to need a boost of voltage to get the engine started. This may be due to poor battery cables, a bad ground connection, a poor starter solenoid, and a couple of other issues. The first thing you want to do is perform a visual inspection of the starting system. Make sure there is no corrosion build up in the battery cables. You can also check the resistance across these wires and make sure you have a solid connection between components. You then want to make sure the starter solenoid is doing its job. It is responsible for taking the small amount of electricity sent by the ignition and turning it into a huge electrical charge that is strong enough to push over the engine with the help of some gear ratios in its favor. Do some more testing, and stick to the basics before assuming its something seriously complicated.

New battery & fuel pump. Hours later car starts and shuts down 3X in a row. Finally it starts, 48 hours later, won’t start at all
ANSWER : Checking all the fuses was a good move. I would also want to put a scan tool on it and check for diagnostic trouble codes (DTCs) as well as seeing the data that the computer is seeing.

A fuel pressure test would be a good idea to verify correct pressure and so that you’d be able to eliminate that possibility. It should be 58psi on your Magnum.

I also recommend getting your battery tested (I know, it’s new, have it tested anyway) and be sure it’s charged to at least 75%. And yes, loose battery cable connections can result in electrical problems.

If you need some assistance with this, consider enlisting a certified mechanic who can perform the checks I’ve mentioned and diagnose your starting issue firsthand. The mechanic can then perform the necessary repairs once the problem has been isolated. Good luck.

2005 Chrysler 300C changed battery and alternator. Car started, ran, and then battery light came on. Shut car off and wouldn’t start.
ANSWER : Hi. There is a couple of things that could be wrong here. The battery or alternator that was just installed could be defective. Theses parts need to be tested for proper operation. There also could be a fuse, fusible link, or wiring for the battery or charging system that is blown or broken causing the battery light to come on.

The codes that you have will cause the car to shut down, run rough, or not start at all. The crankshaft sensor and camshaft sensor should be replaced. I suggest having a certified technician from YourMechanic come diagnose the charging system and check engine codes to help you proceed with correct repairs.

Vehicle won’t start, once it’s jump started it only stays running until you turn it off, then it work start again without jumping.
ANSWER : Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not have enough juice to start it again. Inspect your battery – it should have at least 12.5 to 13 volts to start your car, if it doesn’t you will need to replace the battery. The second problem could be that your alternator is bad and not charging your battery, in this case you will need to replace your alternator. Both the battery and the alternator can be tested in your car. If you would like to have the car checked for you, a certified professional from YourMechanic can come to your car’s location to diagnose the starting problem and proceed with repairs.

Car not starting, replaced battery and alternator fuse but now inside fuses are blowing and still not starting
ANSWER : Hi there. It is quite possible that you have an exposed electrical wire or a short somewhere in the electrical system that is the root source of your starting issue. A fuse or relay will continue to break when the circuit is unable to complete. This is typically due to a wire that is pinched, frayed or a ground wire connection that is faulty. Due to the multiple possible sources of this problem, I would recommend having one of our experienced mobile mechanics come to your location to complete an electrical problems inspection, so they can determine the root source of this issue and recommend the right repairs.

Replaced battery and truck still won’t start.
ANSWER : Hi there. This can be caused by a number of things depending on what the vehicle does when you try starting it. If it does not crank at all or make any noise then you may have a bad battery cable or a failing starter. If the engine is cranking over and it is just not starting then you may have a fuel system issue or maybe a bad coil. You should enlist the help of a certified mechanic, like one from YourMechanic, who can thoroughly inspect your truck’s starting system.

Changed battery and the fuel pump and car still slow to start. When it does start it shuts off without warning. Fuel filter is fine.
ANSWER : Hi there. The battery could be dead even though it has a full charge. There could be a dead cell or an over charged cell. Have the battery checked with a load tester. This will place a load on the battery and the battery is not to drop more than 3 volts during the test. If the battery drops more than 3 volts, then the battery needs replaced. Also, check the starter and ignition system for any faults. Look for corrosion on the ignition wires and see if the cables to the starter are loose. If you need further assistance with your no start situation, then seek out a professional, such as one from Your Mechanic, to help you.

Won’t start. Replaced starter and relay switch, still won’t start. Tested battery and it’s good.
ANSWER : Hey there, thank you for asking about your 2001 Nissan Pathfinder. You should check fuse number 18 in the fuse panel under the dash. Test the black and yellow wire at the start interrupt relay to see if it gets power when you turn the key to start. If it does, then you are getting power from the ignition switch. Then check the black and pink wire at the relay to see if you get power when you try and crank the engine. If you get no power, then you may have a bad neutral start switch on the transmission. Try to move your transmission through gears and neutral while trying to crank it, holding the brake in case it starts. If you find it will start in one of the gears, then check the shift linkage. If it’s okay, replace the shift interrupt switch on the transmission. If you want to have this checked by a certified mechanic, a technician from YourMechanic can come to your home or office to inspect your starting problem.