The age of your vehicle might suggest that wires in your interior fuse box have either come loose, corroded or shorted out. The high current once like A/C and interior fan may have caused the wires at the back of the fuse box to become embrittled due to heat. I once had a problem with my starter circuit where the wire became so hard it couldn't be bent. I replaced the section of wire to the fuse box and all the starting issues went away.
The only explanation for the Airbag and ABS, is that they too go to the fuse box. I suggest checking wires behind the fuse box for the affected circuits (if you can remove it enough to see and feel behind it). Using the VOM you can check for power at your fuses and focus on the ones without power. Then check those wires first (remember most circuits don't energize until the key is turn on).
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Well I went outside this morning and the problem is still there. The batter is about 2 years old. The post are clean. I will check the connections at ground.
Its kind of strange that everything else works...lights, horn, radio. I wonder if there is a relay that connects just that circuit. I guess its time to get out the VOM and start probing around.
I will try the axillary ground Idea and see what happens.
Later on
Joel
You probably have a bad electrical connection that gets worse with heat. The fact that you loose many functions, tells me it is main power or ground that is being affected. Could be a bad battery cell. positive or negative battery cable connection.
Have you replaced the battery? If you have replaced the battery and have the same problem, probably not the battery but can still be the connections at the posts.
The next time this happens (where you loose the electrical system), connect a black jumper cable from the battery ground post to an engine or chassis metal bracket and see if you get power again.
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