check your battery ground and your alternator ground
Generally the battery ground lead is connected to the engine block and the alternator is bolted to the same block via metal brackets and thus connected electrically to the battery ground.
you have a ground somewhere
You might have a bad battery, a poor connection between the battery and alternator, or a bad ground from the battery.
Yes, if it shorts to ground internally.
usualy if the alternator is not defective then its the battery. you should start by cleaning the battery post. then you could check the terminal wire that runs from the battery post to the alternator. if thats not it you should check the ground on the alternator.
I will be honest I am not fluent with the yr model however the electrical voltage and wiring and charging and output I am!I would try by cleaning the ground wire from the battery to each point it connects.I would also take a meter to check with the truck (key off) and check for a parasitic draw.That means like is your dome light staying on,or if the radio is aftermarket version may be draining the battery as well.If the terminals or rather the metal connectors on the battery positive,and the alternator connectors are clean,no corrosion would reduce the charging of the battery.It would only seem to me it is a bad ground overall,And would remove the each connection for the ground cable from the battery to each point clean it with a wire brush,and tighten.Unless something electrical such as the radio head unit (aftermarket versions) is drawing amps and draining the system,or this model has something else that draws current dome lamps,door switch not all the way in but pulls enuff to drain it down I do not know.Being you changed the two items would point to bad ground connections,or a parasite draw over time draining the system in most cases or even a weak battery cable,alternator wire or wires.Hope this helps.
You may have a short circuit somewhere that is leaking current to ground. Or you could have a bulb or accessory that is using current even when the vehicle is turned off. Improperly installed aftermarket stereos & amps are a notorious cause of this.
Yes This Cable Is Connected To A Group Of Cables That Run To The Battery Positive Side, To Allow The Alternator To Charge The Battery.,Do Not Remove Or Install An Alternator Until You Remove The Ground Terminal From Your Battery.
This might mean the ground is isolated from the case of the alternator. In a normal application, the case of the alternator is the ground connection and being bolted to the engine block via a metal bracket, the grounded case of the alternator is electrically connected to the ground lead of the battery which is also connected to the engine block. An isolated ground might indicate the alternator ground is electrically insulated from the alternator case.
Negative battery cable - a solid metal part of the engine
voltage regulator.