Update:

I've spent some time today to check what might be turning my battery indicator light on all the time.

I couldn't find any voltage drops anywhere, front, back, grounds, nothing.
Voltage is very regular at idle and reving the engine (13.5-14.1 Volts).

Did a load test at 2000 rpms and voltage is 13.4 Volts constantly.

I've no blown fuses whatsoever, I cleaned almost every single fuse contacts and changed some, same for relays in E-box, glove compartment and trunk, also the big ones where the 200A is located after positive lead.

Now, I tried checking voltage at alternator harness for terminal 15 and 61E (that actually makes the battery light to go on) all seemed ok. Then I unplugged the harness and started the engine, and to my surprise the light is still on!!!! WTF

Shouldn't the light go off after unplugging this harness? or am I missing something???

This is driving me crazy for real. System is charging. How I know? well, it has been 3 months since I got this issue after the shop changed all the timing guides, chains and stuff and my battery keeps charge to crank the engine every morning.

Please, if anyone have any clues that might lit my desperate path into this, you'll more than welcome to contribute.

¡¡¡HELP!!!

The wiring diagram shows that the DME in control of the dash light. Any chance wires are switched at alternator? What was load test results?

Wires seem fine, correct position, no signs of being broke.

Load test resulted in 13.4 Volts.

Where did you get your wiring diagram? Any chance of sharing it?

I'm not much good with posting pictures, maybe Quicksilver could help out with that? Load test means AMPS not volts. I have a feeling you don't understand how to measure a voltage drop so that is probably throwing you off as well.

You're probably right, I'm just learning and trying to understand what's going on. I know the difference between volts and amps, however my voltmeter is not able to register more than 10A so I think it'll be useless for this purpose.

I'm going to a friends shop that have better equipment, he might have the right tools for this too.