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ITS NOT NECESSARY TO BE THE BATTERY CHECK ALTERNATOR IF ITS CHARGING OR NOT BY CHECK VOLTAGE BY VOLT METER IF IT SHOWS MORE THEN 12 V WHEN THE ENGINE RUNNING ALTERNATOR IS OK IF NOT REPLACE OR REPAIR IT. AND ALSO YOU CAN REMOVE BATTERY CABLE IF ENGINE OFF ALTERNATOR IS NOT OK.
Only needs two wires, run a 40 amp cable from the large terminal on the alternator marked +, direct to the positive terminal on the battery or to the battery supply feed to the starter (which ever is easier). Then run a wire from the terminal marked 'ind' to a 5watt bulb, other side of the bulb needs to be wired to an ignition live feed. That's makes it the charge indication light. You need to fit this light, without it the alternator will not charge!!!! Light will come on when you switch the ignition on, and go out when the engine is started. Put a volt meter across the battery, should get a reading of 13.5 to 14.5 volts with engine running. Good Luck.
Maybe it wasn't running long enough to charge up the battery? Stop trying to jump it, when you are having problems with it dying, take the battery off and have it charged. And/or buy a $20 voltmeter to see what the battery shows. If it says less than 12 volts, it is discharged, and needs charging. A good battery that is not run down should have at least 12.5 volts. A new battery that is charged should have very close to 13 volts, maybe 12.8 volts. When you have the truck running, check the alternator for charging. You put the voltmeter right on the battery and check it again. This time, with truck running, battery should show at least 13.5 volts. That shows the alternator is working. A good alternator will put out about 13 or 14 volts-the regulator will keep it from going any higher to prevent problems, like a melting battery or electrical parts burning out. I would say get the charging system working right, then address the problem of dying at stop lights. That could be a carburetor problem, if the alternator is working.
check the metal pipes under the car front to back they rust through and leak the water pump coud be the problem or the HEAD GASKET this is a common problem on this engine check for contamination in the engine oil ie.white sludge
Put a volt meter on the battery and start the vehicle,see if the alternator is charging to the battery,it should read 14.25 volts with all lights and blower off,and should not be less than 13.75 volts,with headlights on,and ac on high blower motor,it should read 13.65 volts,to 14.25 volts.Also check all fuses to make sure they are not blown,and make sure the large wire on the alternator shows 12 volts or more with the key off.If this wire does not show voltage,or less than battery voltage(12 volts) then that wire is not connecting to the battery positive side.
It sounds like the battery has gone dead and will need to be replaced due to a bad Alternator. Once you get the car started, check the voltage on the battery, there should be 13.5 to 14.5 Volts. A fully charges battery should have 12 volts with the engine not running and once the engine is running there should be 13.5 Volts with the head lights on and heater on too. If there is less then 12 volts reading on the battery with the engine running, then replace the Alternator. You can pick up a Alternator at Auto Zone and they can give you the step by step instructions to replacing it with common tools and they can also check the Alternator in your car to before you buy the new one. Good luck and hope this helps and insect the wire harness from the battery to the Alternator, look for any sighs of damaged like corrosion and repair any damages to the wire harness.
Check the alternator is not faulty.
The battery terminal voltage when engine is running should be approx 14.5V with headlights or venilation blower motor running.
The battery light indicator 'on' usually means the alternator is not charging.