Low voltage at low revs

Put a multimeter on dc. Place the probes on the battery terminals. You should see between 13.2 and 14.8 volts with the engine running. Do this at idle and while you rev the engine too be sure the voltage regulator is not under or over charging the battery

P0340 JEEP - Camshaft Position Sensor Circuit engine cylinder Bank 1 Sensor 1

Possible causes- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty Camshaft Position Sensor
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery

Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.

Read more: http://engine-codes.com/p0340_jeep.html#ixzz25iQflrEb

This sounds like the alt is not charging, but a eak battery will also cause this condition, what you can do is have the charging system tested. if you have a volt meter you can connect it to the battery with engine running and acc off you should have 13.5-15 volts,this is a good alternator, then turn on all acc and check it, it may have a low reading but should atleast go to 13volts and then when you rev it up it should go to 13.5 - 14.7. if the readings are low replace alternator.

HAVE THE ALTERNOTATOR CHECKED TO SEE IF ITS PUTTING OUT ENOUGH VOLTAGE SHOULD BE OVER 14 DC NOTHING 12 V. OR UNDER DC VOLTS

Hi, you need to have the battery checked and make sure it is properly charged. The problems you listed are signs of low battery voltage.

P1682 - Charging system voltage to low.

Hard to say exactly with out checking myself;

Wrong (to low amps) battery, poor condition of battery clamps, loose cables going from battery to starter assembly, battery installed in reverse polarity. Perhaps the NEW battery need to be charged ( storing a battery on concrete (cement) slab will cause a drainage of the battery and it doesnt take long)

is the alternator charging? What kind of voltage reading are you getting when engine is running? If alternator is not charging, your vehicle relies on battery to stay running, after battery runs to low, it will stall.Continuing this may result in replacing battery also. Have a load test performed on battery before replacing.

your battery is dead from cranking it so much. Charge the battery and then it should start