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When instruments malfunction for no apparent reason, check the instrument voltage limiter (also called instrument voltage regulator), which controls electric current flow through the instruments. Instruments do not receive 12-14 volts of electricity like the rest of the system. They get less thanks to the voltage limiter. When the instrument voltage limiter fails, all instruments will either max out or not work at all. It's an easy fix. When just one instrument is acting up, it's usually the sender or instrument that's at fault. Checking the regulator with a test light will show a pulsing light (which is how the regulator limitsthe voltage). View Related Article
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