Battery lite came just replaced the battery and chkd alternator (it was good). I jump the battery and trk stays running about 10 mins and dies. Could it still be the alternator?

Alternator is the correct diagnosis.

Combination of brake and battery light mean the alternator is not charging. after you wait for a wile the battery recover some power and will run again but as soon the power drop below 9V the engine die. Test the charging system and replace the alternator
Good Luck

Replace your alternator
murf427

sounds like the alt. is not the problem.does the battery drain while the truck is sitting or running?

Was the alternator tested off the truck on a bench tester or on the truck with the engine running?
If bench tested check the fusable links at the starter switch and make sure one has not blown. It will stretch like a rubber band if it is blown.

it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

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check with voltmeter to see if you have 12 volts at battery with engine off.

check for 14 1/2 volts with engine running at1500 rpms.

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Altinator is faulty.

keep in mind, your engine use both source of power to run, one from the battery and one form alternator. If the alternator is good, your engine should stay running regardless if the battery is good or bad, the alternator should keep the engine running. It sound like to me the alternator is faulty not charging your battery or keeping your engine running, even though the alternator is brand new does not mean is good. My guess I would take the alternator back and get another one. the reason why your car ran for 25 min and die it has no source of power to keep the sparks going although the alternator should keep the engine running and at the same time charging the battery but is not.

That may be a sign of a bad alternator. start you car and take the positive batter cable off the battery. If the car dies replace the alternator. That is a really good sign that your alternator is bad.