I just remembered something. If your rheostat is turned some, your LED lights may not come on. D'oh! If your rheostat is turned to all of the way bright then follow the directions below. Stop and investigate for any failures. Disconnect the Combo switch and unplug your gauges from the dash harness. First, check to make sure you have 12 VDC to ground on the GL wire in the dash harness at the Combo switch. Next, check for continuity (<1 ohm) between the GL and GW wires on the Combo switch. After that you can plug in the Combo switch and go to all of the dash harness connectors for the gauges and check for 12VDC to ground at the GW wire. Disconnect the Combo switch again. Check for continuity (<1 ohm) between the RL wires and ground. If the resistance is high, it may be the rheostat.