Not necessarily.... The alternator is producing power as it should be and the problem exists in a connection between the alternator and the rest of the vehicle.If it will start and run, look for the battery icon on the IPC. If the generator or the fusible link is bad that should be on.
If the car is having problems that are electrically induced, then power from the generator is not getting to where it is needed, and the system should detect that.Not necessarily.... The alternator is producing power as it should be and the problem exists in a connection between the alternator and the rest of the vehicle.
Common alternator dummy light wiring.
battery + ======= LAMP ======= alternator output +
This done using a wire that is not attached to the rest of the cars electrical system. It is a direct attachment to the alternator. If the output from the alternator fails that "+" in the above diagram turns to a "-" and the light will come on. Because there is no issue with the alternator it is outputting the + as it should be no light will come on.
Hi KG,Look at the wiring diagram below There are 2 wires that come off of the alternator that are connected to the ECM. One of the wires is for the field and gets sentfrom the ECM to the alternator to energize the field so the alternator creates electric. The other wire sends voltage from the alternator to the ECM this is how the ECM knows the alternator is working or not This is a completely different circuit then where the fusible link is.
View attachment 121750
an alternator only needs a single wire connected to it for it to generate power. That is the field signal wire. The housing of the alternator must also be grounded to the same ground as whatever is sending the field signal. They are not like the old school alternators that had external voltage regulators and has diodes and a grip of wires attached to it. everything is internal now. But in order to make sure the alternator is outputting and the low voltage on the power system in the vehicle is not load induced an isolated circuit is used.
Thanks, I have a digital version which seems to be PDFs pulled from a GM service website. They are extremely helpful but KG' interactive version picked my interest.there are various online digital versions of the whole set of manual, i and others have posted them BUT i forget what it was i posted. a search might find them...
It doesn't.How does a dirty throttle body end all electricity in the car?