No A/C, Power windows, gauges - related?

[ActionClaw]

A little background on this car

The following do NOT work:

• Power windows (Power locks do)
• Air conditioning (blower fan does)
• Entire gauge cluster (tach, speedo, fuel, etc) and assoc. lights

Background:
I was told all was working fine then owner went on vacation a week or so and found it like this upon his return. He wasn't keen on the idea of paying hourly for unlimited electrical troubleshooting since he had to sell the car soon anyway due to moving. I no longer believe this to be the whole truth since I found the cracked open A/C relay with a screw crammed into the contact.

I realize there are all sorts of possible reasons for the AC or power windows to fail but (assuming what I was told is accurate) I think the key to solving this is that both the AC and power windows (I'm not sure about the dash) supposedly died at the same time.

Are they on the same circuit? Do they share the same, fuse, harness etc.? Could they all be caused by one common failure or might there be 2 or 3 separate issues?

I've found three fuse, breaker and/or relay boxes:

• driver's side dash panel
• driver's side under hood
• passenger's side under hood near wiper reservoir

I haven't yet personally finished checking all the fuses. Prev owner supposedly did.

- I don't recall seeing a fuse marked as AC or PWR windows. Do either of these share a circuit with something else and, if so, how is it identified?

- Are there more fuses elsewhere? Do either of these use a separate fusible link?

I read someone with a similar problem suggest that it may be due to a crimped wire running from door to dash. I'll be checking into that. Any help with the above questions much appreciated.

Thanks in Advance!

[Crasoum]

Check the battery posts, and the grounds from the battery to the car and fuses boxes.