Trailer Turn Signal Lights Not Working — Diagnosis Starting Point You signal a turn, and the trailer’s signal lights don’t […]

Trailer Clearance Lights Not Working — What to Check on the Tractor The clearance lights — the lights along the

Trailer Marker Lights Not Working — Where to Check First You walk around the trailer doing a pre-trip check and

Trailer Stop Lamps Not Working — Fuse, Relay, or Wiring? You hit the brakes and the trailer’s stop lamps don’t

Volvo D13 Headlights Not Working — Why a Fuse Won’t Fix It Headlights go out on a Volvo VNL with

AC Throwing Hot Air? The 3 Most Likely Causes in Order The AC is on, the fan is blowing, but

Fuel Gauge Reading Wrong — Why Trucks Have This Problem The fuel gauge shows more (or less) fuel than you

Truck Won’t Start in Cold Weather — Where to Start Looking Cold morning, you turn the key, and the truck

Truck Battery Keeps Dying Overnight — Finding the Drain You park with a healthy battery, and by morning it’s dead

All Dash Warning Lights Came On at Once — What This Usually Means You’re driving along and suddenly the entire