...Idk how to add the fancy quote thing...
Click the >QUOTE"< button at the bottom of the post you want to quote. You can delete what you don't need between the 'quote' bookends to leave only what you're going to comment about. I always put '...' before and/or after any part remaining when I delete part of the complete quote - just like I did on what I quoted from your post.
Peva, Im not worried about the window motor either. Im talking about anything that runs off the electrical system I.e. cooling fans, multiple window operation, heater, radio...anything that puts any stress on the alt that makes the rpm's drop. (An obvious sign that the alternator is being worked but non of these should put that kind of stress on it....
If the alternator were not able to handle the load, that would cause the voltage to drop and the load on the engine would be less than if the alternator were maintaining the system voltage under that added load. I don't know how much drop in rpm you're seeing, but if it's significant, that is an indication that the IAC (Idle Air Control) motor (the thing that closes the loop on engine rpm based on the set point programmed into the PCM) is not working properly - usually needs cleaning.
You're saying that the idle drops simply from turning the radio on? Unless you have the volume turned up, I wouldn't expect the radio to be enough of a load to affect the idle noticeably. The engine cooling fans and cabin fans, yes, but not the radio.
I plan on replacing the alt with a high output(if I can find one cheaper than 600$)
If you do and nothing else is changed, I predict that the same thing will happen because the turning on of additional loads will still be transferred to the engine, and the "beefier" alt. will do an even better job of transferring those loads to the engine.
I guess what im asking is if I do get a h.o. alternator will it fry the voltage regulator in the ecm?
I don't think the higher power alt. demands any more field current, which is the load on the regulator circuit of the regulator circuit. I could be wrong, but I think at a given field current (controlled by the regulator circuit), the higher amp alt. puts out a higher current than the standard alt. for the same field current. But even if that's not true, I haven't read of any problems with the regulator when people have put in the higher current alts.
...Remember this a 2.7 trep...smaller motor than the Lhs 3.2's and 3.5's.
Exactly. That means that for a given added electrical load transferred to the engine, that's harder for the 2.7 to compensate for. *But*, the IAC motor is supposed to close the loop and add more air for more power (fuel) to keep the idle steady. That's why I wonder if your IAC needs to be cleaned.
I'd be curious to know what the system voltage is with minimum loads turned on (1) with the engine at idle, and (2) with the engine at about 2000 rpm, and what happens to the system voltage when you turn on a heavy load (cabin fan to high speed) (3) with the engine at idle, and (4) with the engine at about 2000 rpm. If the voltage is to spec. (between 13.5 and 14.5), then that would confirm that the alternator is doing its job.