Truck will not turn off with ignition. Alternator whines as soon as the battery is hooked up.

Put a 1993 chevrolet 350 into a 1995 chevrolet extended cab. Had a 305 in it. Got a new ignition switch check all the grounds except the ones behind the cab. I replaced the iginition switch. Everything is hooked up as it should be and I am just stumbling in a circle. I just can't figure it out.

My car has 260000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. If the alternator is whining when the battery is hooked up, then there is a wire hooked up incorrectly in your truck on the charging and starting circuits. Check all of the wiring from the alternator to the battery and fuse box. Then check all off the wiring from the ignition switch to the starter. You may have to replace the alternator. If you need further assistance with your electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

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

The one wire design is energized with a special sensing cicuit built into the internal voltage regulator. This circuit senses the rotation of the alternator s rotor. The rotor must turn at sufficient speed to trip the circuit, starting the charging process.
Poor ground connections are an often-overlooked cause of low charging output and alternator failure.
Excitor wire is needed to generate the voltage required for the alternator to start running. The positive and negative cables are small and connected to the respective terminals of the battery. The alternator also shows a connection with the `battery charging wire.
The exciter wire is used to turn on the voltage regulator. This wire, when unplugged, should have approx. 12.5 volts with the key on. If it does not then the alternator will not work.
While the size of your fuse depends on the amperage of your alternator, you should generally select a fuse that can handle more amperage than your alternator is able to output. For example, if your alternator outputs 200 amps, you should choose a fuse that`s no less than 200 amps.
Alternator Charge Wire Sizing

However, a 4-gauge wire is probably a good idea. Smaller AWG produces more resistance.

The wire from the solenoid to the starter is called the main positive starter cable. The wire from the relay to the alternator is the main charging wire.
The self-sensing voltage regulator used in single wire alternators does not need a switched 12-volt exciter circuit wired to it like a 3- or 4-wire alternator with external regulator. This self-exciting voltage regulator only needs to see a certain engine rpm to connect the battery to the regulator and begin charging.
REQUIRES A GOOD GROUND

In order for an alternator to charge properly, an alternator must be grounded to the engine block.

What is a shunt or self excited excitation system on an AC alternator? An shunt or self excited excitation system on an AC alternator works by taking the power for the AVR directly from the main stator winding.
What is a shunt or self excited excitation system on an AC alternator? An shunt or self excited excitation system on an AC alternator works by taking the power for the AVR directly from the main stator winding.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I parked my truck for 5-10 mins. Tried to turn it on, now it wont start, called a tow tow truck 15-20mins later my truck turned on
ANSWER : It is very likely that you have a powertrain control module failure. This can happen often on many GM vehicles. I would recommend having the powertrain control module tested and replaced as necessary in order to resolve this issue. After the powertrain control module is replaced, a reflash procedure will be required so that the vehicle can relearn all of its primary engine data. Once the reflash is completed, your vehicle should no longer have this issue.

Truck will not turn off with ignition. Alternator whines as soon as the battery is hooked up.
ANSWER : Hi there. If the alternator is whining when the battery is hooked up, then there is a wire hooked up incorrectly in your truck on the charging and starting circuits. Check all of the wiring from the alternator to the battery and fuse box. Then check all off the wiring from the ignition switch to the starter. You may have to replace the alternator. If you need further assistance with your electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

When I turn the ignition over the truck just clicks once and it won’t click no more As if it gets stuck
ANSWER : Your problems may have its origin in either the ignition switch, or a current drain in the vehicle. Make sure the ignition switch doesn’t have a high voltage drop in the run or start positions. This would affect both engine start, and continued running. Replacing the ignition switch would be the resolution if this is the case.

Check also for current drain greater than about 50 milliamps on each circuit after the engine has been turned off, and all accessories are powered down. Any current drain greater than this will drain the battery quickly, putting a strain on the alternator, and making engine start difficult if not unsuccessful.

I would recommend having YourMechanic diagnose this issue, provide an accurate assessment of damage, and estimate the cost of repairs. YourMechanic can dispatch a mobile, professional mechanic to your location for a diagnosis of your starting issue and make the necessary repair.

Engine turned off but inside of car still on, now engine won’t turn back on.
ANSWER : Hi there. The symptoms you’re describing with your boyfriend’s 2002 Grand Cherokee appear to be related to a broken or worn out ignition switch or relay. The ignition switch on the inside of the steering column is attached to multiple electronic connections that send signals to a relay box; which in turn, sends the signal to the individual components. The issue could be related to the ignition switch, the relay, or any of the components in between. If you want to have the fault pinpointed in person, I would have this starting issue inspected by a trained professional to ensure that the correct repair is made.

Key won’t turn after installing new ignition cylinder and ignition lock. Need help polishing things off.
ANSWER : Hi there:

This problem tends to occur when an aftermarket ignition cylinder is used for the replacement project. The inner lock housing sometimes doesn’t always fit flush to OEM steering columns, which can create the symptoms you’re experiencing.

Here are the directions on how to replace an ignition cylinder article, you should check out. The best option is to remove the old one, and start from scratch. Verify that you’re using an OEM replacement cylinder; as aftermarket parts typically cause more hassle than help in this case.

If you need assistance with fixing this issue, consider YourMechanic, as one of our mobile technicians can come to your home to diagnose the issue with your key firsthand for an accurate repair.

Hard to start. Makes click noise once running amp gauge is nuts bouncing around. Good battery, good alternator built in volt reg
ANSWER : This is an electrical issue which might be due to poor vehicle grounding and/or excessive voltage drops in one or more circuits, apparently including the starting circuit. As far as the battery, if a load test was performed on the battery that will give a reliable indication of condition. Voltage testing would not be sufficient. If the battery passes a load test, basically one has to use the wiring diagram from the Factory Service manual and begin to trace the circuits that are not working. I would suggest that you start with the starting circuit and when testing you have to check for the actual voltage drop in each segment because high resistance may be a, or "the" issue in your case. Based on what you are describing I suggest you request an electrical components diagnostic and the responding certified mechanic will diagnose these faults and estimate the required repairs and cost. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Key turns freely in the ignition but won’t start the vehicle. Accessory power remains on unless the battery is disconnected.
ANSWER : The ignition switch or linkage to the switch is broken. The ignition switch needs to have the small linkage from the back side of the key lock cylinder to turn the switch to start and run the vehicle.

Have the ignition switch removed and inspect the linkage and switch to see if one or both switch and linkage needs replaced. If you need assistance with this, one of our mobile technicians would be happy to come to your location to diagnose the issue with your ignition and make the necessary repairs.

You will need a trained mechanic to work on the steering column of the vehicle with air bags due to the air bag system will need to be deactivated before service on the column switches.

my battery kept draining until i bought a new alternator and battery. i have tightened the belt on the alternator but it still die
ANSWER : Hi there. The best way to diagnose why a battery would constantly drain is to review it’s job and how it is recharged. The battery is responsible for powering all electrical systems until the vehicle is started. At this point, the alternator takes over and also continually charges the battery while the vehicle is in use. A battery will drain when one of two things occurs. First, a battery will drain if it is constantly in use; supplying power to an electrical component even if the key is not in the ignition. Second, the battery will eventually die if the battery is not being charged frequently. However, since this is happening every two days, my initial thought would be that some electrical component on your 86 Olds is continuing to draw power from the battery. This is known as a parasitic drain. The best way to determine the source of this battery issue is to have one of our professional mobile mechanics come to your location and complete a battery will not hold a charge inspection.