2008 4Runner Limited here

From searching, it looks like some stock alternators put out 65 Amps, but I see options for "heavy duty alternators" around, but can't find information about how many amps they can support.

And I don't know if they changed things between the different generations of 4Runners.

I'm looking to hook up an inverter for different "what if" scenarios ad am curious as to how many watts would be sustainable (a 1600W from amazon.com runs $45)

I believe they put out 110amps. At least the V8 alternator.

All 4th Gens generator output are 130 Amps / 1,560 Watts.

Toyota 27060-50320
Denso 104210-3440
12V 50070
Made in Japan
130 Amp

130 Amp alty running at 13.8v (a most realistic #) will support 1794 watts. Knock off at least 50A for engine, lights, etc. leaving about 80A for accessories (1104W).

If you're looking to get this alternator beefed up I only know of two sources.

Mean Green has an alternator that listed for a Toy L.C. w/4.7 rated at 200A. Price I believe is around $375. This will work if casing and hookups are the same.

Dominic Iraggi of Iraggi Alternator is a well known Alty guru. This is a price list of his alternators specifically for the 4.0, but he can do 4.7's as well:

Idle output is 150A for all.

180 amp $479
200 amp $499
220 amp $519
240 amp $539
260 amp $559
280 amp $579
300 amp $599

One Year Warranty standand, with the option of a $99 Liftime Warranty.

You looking to put a stereo in? What types of speakers/system were you thinking of. If you look at my sig, you can see what I have. I pass the headlight dim test at night even when I get those 2 type r's moving. If you have any questions please let me know.

How about for 3rd Gens. I've always wanted to know.

Wow, that's definately more than I expected!

No, wasn't looking at audio (haha, at this time) but was thinking about getting a power inverter for a) snowstorms and b) running devices in the middle of nowhere and was curious what the largest reasonable one I should be able to pick up.

It looks like if I got a 1600W (peak) inverter, I'd be fine for the most part but trying to run a 3000W would simply drain the battery too quickly.