What is the rated current of the alternator?

[White Rim]

I have looked at all the manuals and tried searching the web but cannot find this piece of information.

thanks

[FJWALL]

ask trdsource

[brew]

White Rim,

I found this in another post...."100 amps @ 12 volts = 1200 watts output".

If I am understanding this correctly.... I need to know what would be a estimated average amp draw during normal operation (headlights on low, running lights, etc) plus the 20 amp draw from the 2 added driving lights?

[fjlarry]

I looked on Toyotas site. Tundra and Tacoma w/ tow pkg have heavy duty 130 amp alternators. I don't think the FJ would be more than that.

[yoda]

I believe it's 130 amps.

[socalboo]

On another post, someone pulled it out and it said something in the 90's on the side.

[Baja FJ]

Its in the repair manual I believe , 120 amps and 80 amps is just for the inverter. There is a flow chart on 265 I think that shows power for all devices and lighting(30 amps total for existing off road and aux lights harness).

[Baja FJ]

Baja FJ previously said:

Its in the repair manual I believe , 120 amps and 80 amps is just for the inverter. There is a flow chart on 265 I think that shows power for all devices and lighting(30 amps total for existing off road and aux lights harness).

let me correct myself its in the electrical manual PDFToyota FJ Cruiser: Resources & Documentation Archive page 264 current flow chart

[White Rim]

brew previously said:

White Rim,

I found this in another post...."100 amps @ 12 volts = 1200 watts output".

If I am understanding this correctly.... I need to know what would be a estimated average amp draw during normal operation (headlights on low, running lights, etc) plus the 20 amp draw from the 2 added driving lights?

I dont know. I am kindof getting sick and tired of not knowing exactly how much current my alternator is producing. I am considering installing current shunts (precision calibrated 0.001 ohm resistors) to allow realtime measurments of exactly what is going on as far as the alternator output, and also the charging current, and of course, the difference between these numbers, which is the current running the vehicle's lights, engine etc.

BTW While the inverter has an 80 amp fuse, it probably does not draw near 80 amps except when running a full 400 watt load. It would be interesting to see a graph of the input DC current at 12 vdc vs the output AC current at 115 vac

[bartt]

So did anyone ever get a definitive answer as to the output on the alternator?
I need to know, since I am working on a dual battery circuit and want to size the MOSFETs properly.

Thanks.