Hi fallen34685,
With so much power usage, the normal 70 or 75 amp alternater sure is not going to be enough. 90 amp should do the job nicely.
Without the system you should not be having any problem unless there is some other components draining the battery or the alternator is not charging enough. It could also be due to poor battery terminal contacts.
Check battery voltage before starting to see if it is ok and test the charging rate.
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Wednesday, June 25th, 2008 AT 11:03 AM