i seem to have an odd electrical problem. my voltmeter is doing some crazy things. when i crank the car up and have the E brake on there volt meter goes to a little above 13 where it should be normally. upon putting the E brake down ther voltmeter goes below the middle line to about half way between the red and the middle line. i have no clue why it would do this. suppose i start the car and i have the e brake up and leave it up just enough to make the "brake" light come on. the voltmeter will go to above 13 and stay there until the E brake is pushed down and off.

this odd occurance happens about 80% of the time. doesnt matter whethers the motor is cold. warm. or if the headlights are on or off

 

One of the wires that is used for the BRAKE light on the dash is probably broken or partially broken. There is a switch at the base of the e-brake handle...check there.