Editing Talk:1997 Cadillac Seville killing batteries

I have a 1997 Cadillac Seville and it killed 3 batteries in the past  6 months.  My local parts store replced  the 700 amp GM batteries for free undr warranty luckily.  I took the car to a cadillac dealer , he went over the car and said the only thing he can think of is replacing all four modules in the doors at a price of app. $1400.  Does anyone have any suggestions.  I'm tired of jumping this car because I only use it about 2 or 3 times a week.  Thanks in advance for your help.  Robbie Novakovich