First of all, all of the circuits you mentioned will have their own sub fuses. Anything shorted in those areas couldn't possibly draw enough current through their little wires to blow a 150 amp fuse because the wires would melt first. That means the short has to be before those circuits branch off, and since they're using such a large fuse, it would be typical to be going to the output terminal on the generator or the feed cable to the starter but starters aren't normally fused and they could easily draw over 150 amps anyway.
Since I'm not familiar with your car, start by measuring for voltage on the generator's output terminal. If voltage is missing when the fuse is blown, see if there are multiple smaller wires bolted to it. If so, remove them for now.
It's also possible there is a smaller positive battery cable bolted to the under-hood fuse box. If there is, and you DO have voltage at the generator, unbolt the fuse box from the car and look underneath for anything that is touching metal.
The next thing to try is to use a pair of small jumper wires to connect a 12 volt light bulb in place of the fuse. When the short is present and the circuit is powered up, the bulb will be full brightness and hot so don't let it lay against plastic parts or on carpeting. The goal is to keep the short occurring so you can systematically disconnect things until something makes it go away. When it does, the bulb will go out or get dim. If there were multiple wires connected to the generator, reconnect them one at a time to see if one makes the bulb get bright, then follow that one and try to split it into multiple circuits.
You could even have something coming apart inside the generator and touching that output terminal but that would be very uncommon.
Friday, June 1st, 2012 AT 6:50 PM