Need Help BAD on 2000 Venture Turn Signals

Can anybody tell me what I need to do about my turn signals on my 2000 Chevrolet Venture van. Everytime I change my fuse out (right hand side of dash panel by passenger seat) it blows within a day. I went from the red (10) to the blue (15) but that hasn't made a difference either. It blinks one or two times when I use them, then blinks real fast, then goes out. I'm at my wits end on what to do next. The dealership wants to charge me a $77.50 charge just to take a look. Is there a simple solution on what needs to be done. PLEASE GIVE ME SOME ADVICE. I'm desperate. Thank you!

I've gone through a pack of 6 in less than a week.

I have a chevy venture 2002 with the exact same problem. The water in the bottom of your passenger floor board is coming from the ac probably draining into your floor board and shorting the wires out. I had to get them to replace all the wiring and because of the water it shorted out my back light circuit board. This luckily for me was covered under warranty. However the ac problem wasnt. However I have found several different people with different venure years and models having trouble with the ac leakage and it should be a manufaturer defect. There is now an updated part for the ac to prevent future ac leakage. Good luck ...my van has had electrical problems from the start 2 years ago from the sales lot its broken down now 7 times. I am ready to sue. Hope this helps you. Good luck