I have a 1998 nissan quest and has charging problem i replaced the battery and the alternator

According to amazon.com,

CAMSHAFT POSITION SENSOR

1997 Nissan/Datsun Truck Quest Mini Van 3.0L FI SOHC 6cyl

The Camshaft Position Sensoris located: Under hood, passenger side, upper engine area, end of intake manifold, mounted in distributor

If your battery is discharging while the van is parked up, there's 3 general causes:

• The battery itself is failing and cannot hold a charge. replacement is the only option.
• There is a fault within the alternator - either the alternator is not charging or it is allowing the battery to drain because the diodes (the rectifier in the alternator) have failed.
• There's a parasitic drain of power somewhere. Something is remaining 'live' when the van is parked up - and draining the battery.

Many places will do a free battery check.

sounds like you may not have enough liquid in the battery ,but if the battery is full of water,it sounds like you may have a dead cell or cell's,check the battery with a load tester,after charging the battery,take the neg.battery cable off the battery,then in a few min.test the battery with a load tester,

has to be the alternator, you can determine if it works by putting in a known good battery, checking voltage when running-it should be at least 13.8 volts at the battery with the engine running. If not you can check the alternator output at the rear of the alternator itself-there is a post, it is positive, use the meter to check here. If you get low voltage here (less than 13), you know it is the alternator.

alternator is bad and the vehicle is running of your battery, make sure belt is tight on alternator if it is then you will have to purchase a new one. Hope this helped tim

Best to remove the front passenger side wheel. Then snap out the clips that are holding the plastic cover towards the front. Now it will expose the belt area. Loosen the locking nut of the tensioner(idler) pulley located to the right of the Crankshaft Pulley. Crankshaft pulley is the one that handles both belts (alternator and the power sterring pump). Right to that next to it, upwards is the idler pulley. You will find the alternator pulley to the right of that further up. Open the hood of the van and locate the adjusting nut behind the alternator on the idler pulley from top and loosen that as well. Once both these are loosened, belt will loosen and will be easy to remove. Now replace it with the new belt the same way it was wrapped. Go over the crankshaft pulley; under the A/C compressor pulley; over the alternator pulley; under the idler pulley. tighten the adjusting nut from the top through the hood until the play on the belt (when pressed in) is less than 1 inch. Now lock the tensioner pulley by tightening the locking nut. Start and run the car for 15 mins to see if everything is ok.

buy manual, i haven't replaced one yet that has not run afterward with no valve damage, but i have heard of some

check to make sure the alternator is charging the battery.crank engine while idling the alternator out put should be 13.5 volts to 14.5 volts. if not alternator is not charging the battery.if alternator is charging battery.the battery is weak.if its over 5 years old its more likely battery.if battery not old checks out good .replace battery cables..

If the car is running and hasnt died or had any hard starts you probably just have a belt tensioner or pulley problem. You can read the charging voltage off the battery with a multimeter and should see a a change from ~12 volts to about 13-14 volts.

it does sound like a fuel pump, i am not 100 percent on that ,
as annoying as it is, u might have to start eliminating possible causes. also try checking your fuel pump relay fuse etc. another possibility check your fuel lines could be a blockage. fingers crossed