Wire should be sized to the load and the fuse or breaker to which it connects. If you cannot successfully terminate a 22 gage wire then you need more training or better tools. The most common problem in wiring is the guy holding the strippers. Nicking or cutting conductors will eventually lead to premature failure at the termination. It is impossible to consistently strip as wire nick free with knife strippers so that is why I exclusively use thermal strippers with Tefzel (and all other except coax) aircraft wire (MIL 22759 or 27500).

Frequently, wire and terminations provided by the manufacturer of components available for the experiment market are inappropriate for an aircraft application. Vision Microsystems is a good example of this as I discarded many of the supplied, PVC insulated, cables in favor of MIL 27500 shielded cable. Remember that the manufacturer will supply the cheapest wire that will accomplish the task and not necessarily the best or lightest. My plane has been flying for almost 7 years, has logged over 750 flight hours and has had one electrical problem, a corroded faston terminal on the alternator Field lead. In wiring my airplane I used thousands of feet of 22 gage wire with hundreds of terminations. None of these has failed.

If you aren't knowledgeable or comfortable in wiring your airplane, seek assistance from someone who is experienced. If you are stumbling in the dark while wiring your plane you will likely still be in the dark after it is done. If you cant do it right then don't do it yourself, get help.

Regards
Brent Regan