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If it jump starts, the starter is good.
You need to check the voltage at the battery with the engine running (after disconnecting jumper cables) to see if the alternator is bad. Voltage should be at least 14vdc.
You can also remove the alternator at home and have it tested at your local car parts store.Always disconnect the negative battery cable before removing the alternator.
The solution is to take a logical troubleshooting approach and not just throw parts at the issue hoping to get lucky. Here are some hints:
1) Measure the battery voltage. Then measure it again while trying to start the engine. If the voltage drops below 10 volts while trying to start the battery is discharged or bad. Charge it and then have it load tested at any auto store -- test is generally free.
2) If the battery checks ok, disconnect the large battery cables and clean the terminal ends and battery terminals thoroughly. That means both the battery end and the engine end. Reinstall the cables and tighten them securely. If you use wing nuts on the battery posts, replace them with stainless hex nuts and a start washer for better connections.
3) If the issue is not resolved at this point, Use jumper cables to jump directly to the starter. Black cable goes from battery NEG to engine block (unpainted bolt or bracket). Red cable goes from battery POS and touched to the large post on the starter solenoid that feeds the starter. If it still doesn't spin, you have a bad starter. If it does spin, then the solenoid is suspect.
The ignition switch, neutral start switch and the start switch wiring can also play into this but I doubt that's the issue. The solenoid can be verified by using a screwdriver to jump the small terminal to the large terminal to which the POS battery cable is connected. If doing that spins the engine, the solenoid is good and the wiring/switches are suspect.
Is the starter engaging when you jump start it? You say you replaced the battery, is the cable ends clean? If the starter is engaging you have other problems, if its not then check out the starter/cables. Good luck!
I would replace the main battery cable to the starter. If that doesn't do it, try grounding the starter case to the frame with a wheel wrench or something similar. If this makes it work, replace the wrench with a piece of cable or heavy wire bolted to the starter case and to the frame.
When you jump the truck does the starter sound like it's dragging or turning hard? If so, it is near the end of its life and should be replaced. Hope this helps.
I would verify that you are getting correct voltage to starter. Use a digital multimer set to DC volts 20 setting. Measure battery voltage at battery. Then measure voltage from large wire (usually red) on starter to ground. (engine block or bolt attaching starter to engine) if there is more than a small voltage difference, check for corrosion at battery terminals and cables. If not corroded and making good contact, replace positive battery cable to starter. If voltage good at starter, (at least 11.5 Vdc), you could have a bad engine ground. Follow negative cable (black one) from battery to where it bolts onto engine. Remove bolt from engine and clean cable and engine mating surface well. (wire brush will do well) Then re-attatch cable. Then set your multimeter to OHMs 200 setting. Test the cable itself metal ends on cable) from battery to block. Should get a reding of zero ohms resistance. If substantial resistance, replace negative cable. Not the complete diagnostic, but will give you a good start at finding a problem. Mike
i had a 95 xj 6 with the same problem. At the fire wall on the right side is a bolt with a rubber cover on it. this cable goes behind the engine to the starter. That bolt at the fire wall my need to be replaced. find it it may be rusted or corroded. If it is, the current from the battery will stop at that bolt and not contunue on to the starter but lights and everything else will work. If when you turn the key you just hear a click or nothing. that part is 5 dollars at autozone.