Alternator not coming on

Hi and thanks for using 2CarPros.com.

Does the problem happen while the engine is running or only after it sits over night?

Do me a favor. Go through this link and tell me the results. It will require you to use a volt meter. Here is a quick link related to using one:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Here are the directions for testing the alternator. Do this and let me know the results.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

I did check for technical service bulletins related to the alternator/charging system, but there was nothing listed.

Let me know the results. Also, make sure the ground to the engine block is clean and tight as well as all battery cable connections.

Take care,
Joe

Thanks, I have done all the basics bought a volt meter it does not do nothing but drop in volts until the battery is at around 10 volts. Then truck idles really low until I cut it off and then it just clicks as the battery is dead. I have took my ground off once before and cleaned it I think my connections are good just alternators not kicking on.

That is why I was asking about the gauge cluster. Battery light it does not come on ever as if I do not have one.

Welcome back. If the alternator is good and not producing current, then it either is not getting power supplied to it or the is an open between it and the battery. Since the light is not turning on inside, I suspect the open may be between the alternator and battery. Have you checked for a faulty fusible link?

Take a look at the schematic listed below. It shows all of the for the starting and charging system. The first one I would check is the 12ga-blue one between the alternator and battery. Check it for continuity. If it is good, confirm that the power from the starter (also a fusible link) is good. I had to break the schematic into two pictures.

Let me know if this helps.

Okay, so the 12g wire is good I suppose, it has 12 volts at the alternator stud I changed the smallest wire fusible link with a inline 30 amp fuse still nothing alternator wont kick on I need someone to maybe face-time sometime tomorrow and help me thanks

Welcome back:
What I need you to do is this. If indicator lamp is not on, disconnect wiring harness at alternator. Ground "L terminal using a fused 5 amp jumper wire. If lamp lights, replace alternator. If lamp does not light, check for a open between the grounding lead and the ignition switch.

So all fusible links are good is there any more beyond this and what di you mean wire harness is that that 3 point connector only other plugs I have is a actual plug wit one wire going into it

The wiring harness going to the alternator. As far as the system, here is a schematic of the entire system. Something isn't making good contact. For example, you may show continuity with a meter, but when a load is placed on something like a ground, it may still fail.

I dontthink I have that brown wire is that a bolt on one or the actual snap in plug wire because I think mine is red I'll look tomorrow after work and get back with you

Let me know what you find.

Joe