Runs fine when dash lights are bright, lacks power when lights go dim
I solved the problem I got rid of it
SOURCE: 99 mercury mystide had rear running light broken
If the driver's side tail light is working, it's not a fuse. Use a test light to check for power at the bulb holder. One terminal will be for tail light, the other for brake/turn light. If the is constant power for tail light, replace bulb. If no power, trace wiring from bulb holder to driver's side junction. Probable broken wire between the two tail lights.
SOURCE: The LED Dash Control Center on my 2005 Mercury
when the headlights or parking lights are on,the readouts will automatically dim to compensate for night driving. that aside, the dimmer switch is could be bad or the wiring has become loose or disconnected or the connector on the readout is loose or has become disconnected. my odometer was randomly going on and off. and tured out to be a loose connector
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