Charging system not charging

Hey Rob,

Let's start at the basics. We need to find out what the charging system is actually putting out so put a volt meter on the positive and negative terminals of the battery and rev the engine to about 2500 RPM and see what the voltage gets up to. Here is a detail guide on this test if needed:

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

Next is to check the connection of the battery cables to ensure they are tight. If they are tight, then you need to ohm out your battery cables both positive and negative. They should be very low, 1/2 ohm or less. If you have an open or high resistance, then you will need to replace that cable.

If the alternator does not charge based on the voltage reading from above and the cables check out, then we need to test the alternator off the vehicle. There are many shops around that will test these for you. We don't want to get to far down the path assuming that your new alternator is good. If it is not charging and the cables are okay, then we need to check that off the vehicle so we can confirm that there is something else causing the issue on the vehicle.

The next possibility is the wiring to the alternator. I included a wiring diagram so that you can see where they go. We need to disconnect them at each end and measure resistance. This will make sure they are not open or have high resistance robbing voltage.

Let me know what you find with this stuff and we can go from there. Thanks