Who told you that...? The whole idea of sudden load disconnects is that regulators, no matter how smart, simply can't react fast enough, we're talking microseconds for the damage to be done. In an ideal world a voltage regulator could react fast enough but they very often don't. The Leece-Neville reg on the 8MR's is no different. Even Balmar, Ample, Xantrex or Sterling regs will not protect you if you suddenly disconnect the load while charging..
You're right... I have not tested this, and don't intend to with a $200 alternator.
I should have said that I believed
(past tense) this to be the case. (not now)
I read Nigel Calder's and Don Casey's book on electrical systems. The problem is, I don't recall it all that clearly.
Regardless, when I want DC power, I turn the selector switch to position 2, and all is good. If there is a problem, I can turn the switch to position 1, and all should
be good. NO ONE touches the battery selector switch while the engine is running. Also, there is a clear instruction on the switch NOT to turn the switch to OFF while the engine is running.
I am still considering removing the wire from the alternator to the starter solenoid (it's about 8" long) and adding a wire from the alternator to the #2 post on the battery selector switch, or the battery itself (either way, a run of about 4').
What I can say with absolute certainty - and I hope that the OP will forgive the thread drift - is this;
- the Leece Neville 12v 90A Alternator (at least the one that I received) does NOT require an exciter wire to be run to the key switch. The original alternator did.
- When upgrading the Alternator Mounting Bracket on a Universal M25, the Pivot bolt SHOULD BE a Metric M10 fastener, and the tension bolt (connects the tension arm and the alternator) SHOULD BE a Metric M8 coarse thread. The kit that I received from Torrensen, and the kit available from SailboatOwners.Com, include SAE Fasteners.
Both of these factoids would have been very helpful, but were not mentioned anywhere in my research in many online forums and websites (including the Prestolite and Torrensen websites).