Disconnect battery when parked?

SlantedMark4 said

This might sound weird and I might get laught on, but I'm just wondering if I'm the only one with this "fear".
I always disconnect the battery (I have installed a battery dosconnect switch) when I park my '74, even on meets. I'm worried about a fire caused by the battery. I mean, if I turn off the car and the battery is connected, there's still some load on the wires, right? I just think due to the age of the wiring, isn't it possible to cause a fire when the battery isn't disconnected?
I have to say, I've had two incidents with the wiring that almost ended in a fire (broken original amp. meter that ended pretty bad and a blown fuse)

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All the running current except starter go throught the ampmeter. With age corrosion or a poor connection can present their ugly heads to cause a fire. Wiring insulation can break down with age when subjected to underhood heat, UV rays, road salt and vibration. If you carefully inspect the wiring for damage or signs of deterioration, you should not expect a problem. That said we are dealing with Murphy's Law when dealing with lassic and vintage vehicles. But parked at a sshow and shine and disconnecting the battery because you are afraid of a fire is OCD. Preventing theft is a different issue, but I would approach that in a different manner.
Now old ampmeters should be replaced with either a new meter or better would be a voltmeter. Volt meters function in a different way to the amps meters. Volt meters have high internal resistance that cuts current to minimal levels, which cuts heat creating current to very low levels, which reduces fire risk immensely. Now if you have a concours contender a showroom new appearance is of utmost importance so retaining the amp meter is important. In this instance I would look for a NOS meter or have a company like Classic Instruments rebuild the original to new or better status.
It is important to keep a 5# or 10# fire extinguisher in the trunk just in case.