Yep, I mis-spoke - thanks for catching that. I was talking about the voltage stabilizer on the back of the dash. It looks like a circuit breaker with two wires going to it.
To test: Turn the key on and test both wires one at a time with respect to ground with a meter or test light. Voltage should be stable on one side, and pulsate on and off on the other. If both sides are continuous, that's your problem. Give it at least 30 seconds warm up time though.