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Altenator is not charging the system. It could be the altenator, regulator (built into the altenator), A loose wire (bad connection). There is a plug on the altenator that signals this light when a problem occurs. start the car and wiggle it or unplug it and plug it back in, this will tell you if you have a bad connection. To check the altenator you need a voltage tester.
Lights will work with a weak battery. Try jumping the truck with another vehicle first. If it starts watch your volt meter and see if it charges up. If you have a indicator light instead watch that. If it flickers the diode is bad in the altenator. If the gauge is present and not charging the altentor is bad. Chack all wiring to the battery and the altenator for loose or corroded connections first. It maybe an easy fix
Usually if it is the anti theft system it should not start with a boost, I would suggest first check the basics have the altenator tested with a voltmeter the volts should read 13.5 to 14.5 if not you probbably have a bad altenator, loose belt, or bad or loose battery connections. Since the battery went completly dead I would suggest having it recharged and tested.
Can be bad solenoid on the starter, bad battery or altenator. First thing I would do is check all the cable connections to make sure they are extremely tight and perfect contact. The slightest looseness or space will cause this. Battery, Altenator, and Starter can be tested for free at most part stores.
this is eithere a loose positive cable from the altenator to the battery or the regulator in the altenator is about to fail. if you have not had any problems starting the vehicle then most likely its a loose connection between the gauge and the charginging circuit or the gauge is faulty. take a multimeter and test the charging votage at the altenator while the vehicle is running it should measure 13.5 volts and should not change more than .5 volts. if the voltage drops more than 1 volt the regulater is bad and the altenator needs to be replaced. if it is working fine then looke for a bad connection make sure all positive and ground cables are tight. if they are replace amp gauge
It sounds like you have answered your own question here...? the thick wire from the alternator connecting to the starter terminal feeds electricity back to the battery though the starter cable when you are running... if you have a manual you can see for yourself in the wiring charts. Hope this helps...
The only thing that comes to mind is electrical connections--battery cable connections (obvious, but worth mentioning) and all wiring to alt. and regulator, nothing loose, corroded? I'd also check the battery by swapping in something else that may fit, or having it tested. Yes, it's new, but I have seen (although rarely) a bad battery that was right off the shelf, wouldn't take a charge.
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