Interesting to note that Maine
is sayingthe Balmar's will blow their 10A fuse--instead of the diode. Which I think just confirms that the diode is not a one-shot device. The question is, rather, if a zapstop has been chosen with enough capacity to survive repeated use. There are 1-watt diodes, and 100-watt diodes, and more available out there. The ones that can survive higher power are usually "stud" designs, that (as you know) look like stubby little bolts, threaded to install in heat sinks. With the standard 500% marine
retail market, those ain't gonna show up at the chandlery
I can also tell you why some automotive alternators have integral protection (against spikes and open outputs) and others don't. Money
. As usual. If you put protection internal to the alternator
, even simple spike protection, those components take hits and eventually fail. Delco had at least one model with internal spike protection and got panned because they were seeing large numbers of failures before the 100,000 mile mark, unacceptable for a car. Originally they though this would be a good idea because spikes can destroy those (at that time) thousand dollar LED tail light arrays, etc. and save a lot of other repairs
. Except, it is hard to convince an owner that you've prevented other problems they can't see. Goodbye, integral protection.
Alternators have also been built to survive "no output lead" conditions because it is also quite common for the output lead to become disconnected by accident
(while work is being done) or age (chafe & loosening) AND one of the oldest cons in the business has been for electrical
shops and highway robbers to intentionally disconnect the output lead for 20-30 seconds and then say "See, this is why your battery
is dead, your alternator
was no good" intentionally blowing an alternator to make more work while replacing a battery.
There are a lot of (as you know) "heroic" regulators in the IC electronics
industry, some of them have worked into alternator design. And if they cost 50c more...they won't be in anything "built to a price", so we can never assume they are.