I got a clock to put into my third hole in the pod and i need a constant 12v even when the car is off. Does anyone know where i could get such wire in the car? I dont want to hack up the fuse box and dont want to plug it right into the battery.

 

One of the power wires to the radio is a constant 12v.
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Grab a voltage tester and start checking the fuse box under the driver side dash.

 

thats what i was thinking.

 

Anyone know how many amps that power wire is rated at?

 

In a '90, the constant-power wire to the radio is blue/red, and it comes from the 10A "Room" fuse. This fuse also supplies keepalive power to the ECU, drives the annoying buzzer that tells you you have inserted the key, powers the rather humorous little devices that Mazda calls interior lights, and on A/T cars, powers the shifter lockout relay.