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Things still vibrate loose or become unbalanced on 20 year old trucks that have been put thru the ringer though.

Maybe the old bolt was wedged somewhere and came loose.

The niehoff alternators are used in the majority of military vehicles with good results. The reverse polarity box protects against incompetent battery installers. That function is irrelevant of the alternator used. Civilian owners can choose to eliminate this function, the military will not. A...

The double alt will be a hard sell to most lmtv owners since it requires reconfig of the batts. This will get alot more complicated on A1 trucks with the advanced charging components.

I have an extra stock alt bracket. The big curved one.

The clutch will fail before the fan does. The only damaged fans I have seen are after the clutch came apart and the fan flew away.

The double alt thing is interesting. But the lmtv shares batts between 12 and 24 volt. The niehoff alternator 12 volt output is half of the 24 volt output divided. With 2 separate alternators stacked like that, if you cannot get the regulators to stay exactly in synch with the low being half of...