Quote:
Originally posted by superjens
Why cover anything? I mean, especially the alternator. It gets soaked when you drive around in the rain anyways, it isn't that sensitive to getting wet. I hose down the engine every time I wash it, and if crap is particularly caked-on then I use some of that orange-based cleaner. After many muddy days and hours on air-filter-choking dusty roads my engine compartment still looks brand new. Go ahead and hose it -- just make sure you do it when it's cold, not hot!! Hot engine + water = bad! 
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If you have mud on the alternator, and you push it in with the water
you will be looking for a new alternator with in couple of days
There are few people who can attest to the from MAXC/NJAX
we all lost our alternators after going through mud, and not having problems for a while , but after washing it and spraying water on the alternator , lossing it with in couple of days
New alternator runs you about 110 from a rebuild shop, and close to 300 from a dealer... so its your choice