"Those 4 items require 90 amps."
I don't have any hard numbers, but I will bet the farm that those devices use nothing near a total of 90 (!!!) amps. 30 amps of heat at 12 volts (=360 watts) would probably give your butt emergency room injuries, not to mention lighting your bike seat on fire.
Hello I had similar questions and I beleive I got some good info from a fellow form member(ionbeam):
The Gen I stator has a maximum output of 490 watts. Best guess over the years has been that the Gen I has roughly 100 watts to spare for farkles. The Gen I stator is rated for 35 amps @ 14 volts @ 5,000 rpm <-- and it is important to note that below 5k rpm your charging system is putting out a much smaller amount of current. I would guess that at idle you have something around 40-50 watts to play with.
The Gen II electrical system was upgraded to 590 watts giving non AE models 200 to 210 watts to play with. The AE servos consume ??? extra watts so if your FJR is an AE you should expect that the servos will take ~40-60 watts leaving 150 to 170 watts for farkles. The Gen II stator is rated for 42 amps @ 14 volts @ 5,000 rpm.
If you think you may be pushing the electrical envelope I would recommend that you install a volt meter like a Datel and connect it to the battery through an ignition switched relay. It is possible to connect the Datel directly to the battery with no switching because it draws so little power – though I wouldn’t.
QUOTE
you seem like a knowledgeable person
It's amazing how you can fool some people on the internet
Nice talkin' with ya!
ionbeam