Intellitronix M9015 LED Digital Voltmeter Wiring Instructions & Wire Colors

This document is the manufacturer's wiring instruction sheet for the Intellitronix Corp LED Digital Voltmeter, part number M9015, with an operating range of 8–25.5 volts DC. The sheet explains that the gauge does not require a sending unit and provides a three-wire hookup: the red wire connects to +12 volts (an accessory fuse or ignition switch circuit is recommended — not directly to the battery, or the gauge will stay on constantly), the black wire connects to ground (the instructions state to connect it directly to the engine block), and the purple wire is the dimmer input. Applying +12 volts to the purple wire dims the LED brightness to 50% for night driving; connecting it to the headlight or parking light circuit makes it dim automatically when the lights are on, while grounding the purple wire disables the dimmer feature. A simple diagram shows the gauge face and wire callouts. The sheet lists Intellitronix's address (10800 Middle Ave., Bldg. D2, Elyria, Ohio 44035) and a technical support line (440-458-4858, Monday–Friday 9AM–5PM EST). The title block identifies the drawing as "Voltmeter Wiring," Revision A, Sheet 1 of 1. A photo of the actual round black gauge with red, black, and purple wires overlaps part of the sheet.