What should the voltage be on a 2004 neon 2.0l at the battery? I'm showing 13v

Sounds like a dead battery which will have a small surface charge after sitting.. check the battery voltage with a voltmeter (cheap tool from Harbor Freight) should be 12 v or higher.. if voltage is below 12v either the battery is bad or the power from the alternator is not getting to the battery.. The easy things would be a cooroded battery cables, loose battery cables, at either the battery the starter or where the ground cable connects to the frame. Jump the car to get it running, check the output from the alternator.. usually red wire.. should be about 13v -14+v. now check the voltage at the battery.. should be the same 13v - 14+v if you do not have this voltage coming out of the alternator with the engine running the alternator is probably bad.. If the power is commning from the alternator but not getting to the battery trace the wire from the alternator and look for the short . post a comment here and let us know what you find.

Trouble Code: P0340

No Camshaft Position Sensor Circuit Failure
Possible Causes:


CMP Sensor connector is damaged, open or it is shorted CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage CMP Sensor ground circuit is open CMP Sensor is damaged or has failed CKP Sensor is damaged or has failed PCM has failed

Depending on the setting of the fan speed switch, the voltage at the blower motor can be anywhere from zero to 13V. The voltage is only present with a key on condition.

all batteries are 12 volt a battery is good shape 11.5 to 13 volts.
If your looking at the gauge on the dash with the car running this shows the voltage amount being sent from the alterantor to the battery which should always be above 12 and not more than 14

If you can jump and start the car then the starter is good.

I had a similar situation where the battery tester showed 13V and green/good LED but I could not start my car. After many tests, I found out that the battery had good Voltage (13V) but not enough Amperage to crank the starter.
I replaced the battery and the car started like a champ!.

- clue to see if you need to replace the battery is if you have used it for
about 3 years or more.
- Dead battery happens a lot more often than bad alternator.

this could be from a number of things. if it ran until you turned it off, chances are it needs a new battery because the alternator would have supplied the voltage while the truck was running, but once you turn it off, there's no juice left in the battery to start it back up again. check the dc voltage on the battery. if it's below 12 after the truck has been off for at least a half hour, replace it. to test the alternator, have the truck running anywhere between 1,000 and 2,000 rpm's and turn on ALL accessories. put the ac on max, turn on the rear defogger if you have it, turn on the radio, (it doesnt have to be turned up all the way) turn on the lights, high beams, and hazards and check the voltage at the battery. you dont want it to be below like 13v dc. also check for any A/C voltage. there should be none. if there's any A/C voltage, or the DC voltage drops below 13V, replace the alternator.

Check your alternator as it sounds like it may be starting to go. The battery light trips when it detects an issue with the charging system. Very rarely, the battery light can trip if there's an issue with the PCM, but this is very rare.

Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be around 12V+-.2. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery properly. If it's above 14V, then it means your alternator is overcharging and damaging the battery.

if the charging circuit is low, then it appears that your alternator is going bad....

Battery terminals, when car is off, should read 12V+-.2V. When the car is running, terminals should read 13V-14V=-.2V

measure the battery when the car is off, it should read just a little over 12V. With the car running, measure the battery again and it should read between 13V-14V+-.2V.... odds are the voltage is below 13V if that's the warning you get and the alternator is not charging properly

Ck the charge rate at the battery posts. The proper range is 23.6 to 14.2v , The higher the voltage the llower the amps. Ie; at 13v Alternator is about 10% under capacity. @ 12v it is charging at max capacity. @ 15 v isthe alt is not charging but frying your battery. 9amps is ok if battery is fairly charged but at start up it should sit on 13-13.6 volts. for about 15 seconds the start climbing to less charge towards 14.2.