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First, check your fuses. Then - The circuit is very simple and you should start at the brake light switch. This is mounted above the brake pedal and lights the brakes when the pedal is pushed. Disconnect the switch and check the voltage at the contacts. Ground one end of your meter leads and set the scale to 20 volts (or so) One leg should show battery voltage and one should show no voltage. If there is no voltage, the problem is on the power feed side of the switch and you should investigate the wiring between the connection and the fuse block. If there is voltage, change your meter to resistance and check resistance between ground and the non-power side. Infinite resistance means that the wiring is bad or all the lamps are burned out. Very low resistence (near zero) probably indicates a short in the brake wiring. Leaving the meter on resistence, check the contacts on the brake switch. With no pressure on the pedal, your meter should show open or infinite. When you press on the pedal the resistence should drop to near zero.
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