First I guess...you need to check the alternator output.

At idle it should be 13.4 volts or higher with no electrical load.

At higher rpm ....1500 to 2000 rpm it should be around 13.60volts to 14.3volts or so.

Although you checked the fuses...they have a problem that causes high resistance at the contact points at the fuse blades.

If they are the ceramic 8, 10, and25 amp type...roll them with your finger to make better contact to the fuse box blades....corrosion on the aluminium type fuses are always doing this.

Living where you, do I suspect this is a wide spread problem.

I always try to find the brass strip fuses and spray them with WD40..

__________________
[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."