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Disconnect the Red battery terminal first and then loosen the serpentine belt by moving the tensioner pulley with the correct socket to permit slack enough to dislodge the serpentine belt from any pulley such as the idler pulley or other pulley. Pay close attention of how the belt is routed prior to removing. Remove electrical connections to the alternator. Remove all alternator mounting bolts to remove the alternator. I would recommend a Haynes manual from the parts store on your vehicle. I will help you now and well into the future with all problems that may occur. Be sure you have a fully charged battery at all times as a low battery will cause the internal voltage regulator to over heat and burn up due to the need for more amperage than the alternator can generate.
Check your alt.. alt voltage output should be at least 13.2, sounds like it's not charging and your possibly running off the battery, as for the dash and tail lights, there both on the same system, check the fuse.
Under the radio. You should hear a click when it operates. If it clicks and the headlights don't raise, then the headlight motor cams need to be cleaned
From the alternator the AC is converted to DC and regulated so as to make a controlled charging at all levels of the alternator RPM when the engine revs. This is to keep the high voltage of AC to DC from damaging the battery and so the regulator/controller is an important part.
So you must first check your alternator voltage/current , then the controller regulator and the battery voltage change can be seen with a voltmeter across it. Also the currrent to the battery can a be checked with an ammeter in parallel.
So check these tips and comment.
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