[rotorwrench]

I'm not sure I understand why some of the components listed are being fused. Fuses are only used to protect wires against shorting to ground or cross shorting to other wires in a bundle. Starters and alternators are not normally fused in the automotive world due to the large changes in current draw or output when they are in operation. The charging wire between the alternator and the rest of the system has to be very well insulated for protection against any possible short that could happen so that a fuse will not be necessary. A fuse will only take the rated amount of current that goes through it. If it's rated at 30-amps and the alternator is capable of 40-amps then the fuse wouldn't last a long time. Starters are only intermittent in operation so they don't need a fuse. They draw a lot of current and even more when they are worn out.

One wire alternators have a built in control system for voltage and the limitation of current output so no fuse is needed between the alternator and the load or buss. An ammeter is usually used in the charging circuit between the alternator and the load. Some ammeters are internally shunted and some use an external bypass shunt that only takes a sample off the line between the alternator and the load. A voltmeter is also a good tool to see if the alternator is maintaining the voltage properly. On a 12-volt system, it should indicate very near 14-volts while operational. It also give the operator a good indication of the condition of the battery before the car is started but it won't tell the operator how much current output is going on.