My truck will not start now. The battery is less than six months old , the starter is less than three months. When starter was put on it started right up, but now having same symptoms again. Go to start won't start get jump takes a while to jump it then it finally starts. it stays started till i get to my destination sometimes it starts back up again sometimes it don't.

alternator or associated wiring suspect... test for 14.4 volts at battery when all is hooked up proper and running.. if less replace alternator or diagnose further the wiring to and from alternator

It sounds like a bad crank sensor or a cam sensor,regardless your first step before throwing anymore parts into it is to have it scanned.This will a least narrow the problem down to a specific area.
Ask for a print out of the scan. good luck

I have a Volvo. it did start, but it set for six months. three months in the snow. put a new battery in , power comes on but does not turn over, no cranking or anything.

Try testing the starter solenoid and the relay.

Ok, if the cranking amps is like 70AMPs or 100 AMPS as measured by an inductive ammeter on the battery cable when starting, and it does NOT start, then it's a bad starter.

However, if it does start, that's normal.

On a car that old, I would check that the battery cable ends are squeaky clean, wire brushed, or even replaced if cleaning is not possible.

Usually, a battery that is tested good will be good under a load test.

Also, try to use an ammeter to find out if there is a drain on the battery above .2 A while it sits there turned off. This could lead to a solution if you investigate where a short may be.

You have a new battery and it cranks. Turning over is cranking. You are saying it won't start after sitting for six months? What is an old mechanic? Was the cable installed at home during the one year layoff? It sounds as though you failed to hold the old mechanic responsible for installing the correct cable or adjusting the one you have ,so it will start. You have a safety switch issue by the sound of it. Make sure you have the right cable and then find out how to install and if applicable,adjust properly

you mit have a current draw. that's wen something is draining your battery over night.take one cable of your battery.tutch it back vary gently is there a small spark.sumthing is on. is there a light under the hood? unplug it. do the spark test is there steal a small spark? make Shir every thing is of and car door shut repeat.take weir's of altor nator repeat test.then you got to do one fuse at a time.belts good alternator good.put a test light between battery post and cabal it will light up if some thing is on beter then looking for spark.you ar telling me your battery gos dead right?and it is new.did it tern over wen the new battery got put in?or do you mean it wont tern over like the starter wont spin.

IF CAR DONT CRANK CAN BE THAT BATERY IS EMPTY, STARTER OR IGNITION SWITCH. IF ALARM SISTEM IS ORIGINAL TRY THIS: CLOSE ALL DORS AND HOOD, TRUNK AND LOCK AND UNLOCK PASENGER DOR WITH KEY. THIS RESET THE ALARM (IF BATERY IS DISCONECTED)
MARKO

How long did you let it run before you turned it off? Try putting a battery charger on it for a while. Then after the battery is all charged up, check the alternator.

The most likely problem is your alternator, but you can check with a volt meter to ensure that is your problem. Start your truck (use a battery charger or jump to start it if you need to) and put your meter on the battery post's. If your reading 13volts or so your alternator is working and maintaing voltage, however if your reading starts dropping to 10 or less(may take a few moments to drop) then it's probably your alternator. You can also check your battery's voltage before starting your vechile, if the voltage increases after you start the vechile then it seem to be charging.

Here's a start for you, hope this helps