AEM and the Alternator Field Signals
- Thread starter TurfBurn
- Start date
OK, so i got my alternator, surging issue taken care of. My stock ECU has something very very wrong with it. It was messing up the voltage going to the alternator, and causing the surging problem. So i got underneath the car, took out the harness that connects the alternator to the ecu, clipped the wires, and soldered them together. This successfully made my alternator a stand alone unit.
Next thing to be disconnected from my ecu, the coolant temp sensor. We are getting crazy readings on the AEM from the stock sensor, so we're going to cut it out of the equation once again, and see if it fixes my fan problem.
Next thing to be disconnected from my ecu, the coolant temp sensor. We are getting crazy readings on the AEM from the stock sensor, so we're going to cut it out of the equation once again, and see if it fixes my fan problem.
You may very likely fry out the regulator in the alternator by doing that.
It may not do it right away, but it's possible. that type of alternator
isn't supposed to like that too much... I swapped in my car to a 626
alternator back before we had solved the alternator issues. Those can be
run standalone safely.
It may not do it right away, but it's possible. that type of alternator
isn't supposed to like that too much... I swapped in my car to a 626
alternator back before we had solved the alternator issues. Those can be
run standalone safely.
Jeph, one thing I learned is that the stock ecu is not as messed up as we think. Every problem that we came across was our fault (wiring) not the stock ecu. Heck, we thought I had two bad alternators until Steve helped me shed some light on the wiring issue. Turns out, both my alternators are good. 
This is why I ask that you put up your pinout. For example, are you sharing pin #4 (#4 of 104 stocker ecu) with the AEM or did you sever it completely?
This is why I ask that you put up your pinout. For example, are you sharing pin #4 (#4 of 104 stocker ecu) with the AEM or did you sever it completely?
I agree, I had the same problem with mine. Now my fans turn on, and i solved my own alternator problems. I hope it holds up, i haven't had any problems with it since i cut the wires, and made it operate within itself.
I am still having problems with my tach below 2500 rpms, and above 6000, it jumps around alot, and above 6000, it just flips back to 3000 and stays there.
I am still having problems with my tach below 2500 rpms, and above 6000, it jumps around alot, and above 6000, it just flips back to 3000 and stays there.
if your alternator is going bad you will not see an even charge rate between 13.4 and 14.2 volts. If you are outside of that range you likely have isssues.
Our stock alternator is not able to be hard wired. It has to have the stock ECU providing signals or it will fry out or stop working for one reason or another. It's a PD style alternator not an FL like older alternators that can be hard wired.
Our stock alternator is not able to be hard wired. It has to have the stock ECU providing signals or it will fry out or stop working for one reason or another. It's a PD style alternator not an FL like older alternators that can be hard wired.
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