Tester plugs into tow vehicle and LED illuminates to show if connectors are correct and working. Check turn signals, tail and brake lights on your trailer.
Handy low cost item for trailering. Get a 4 wire extension too. This allowed me to make quick checks on my truck wiring. Appears to be a good quality item. I strongly recommend getting a 4 wire trailer extension wire setup (maybe 48 inches or so, depends on your vehicle) so you can make solo tests from the driver’s door as you use turn signals, brakes, etc. You can just hang the tester near the back of the car or truck with masking tape. In addition test the running lights, turn signals and brake lights while the 4 way flashers are on, just to be sure…
4 wire inline testor
Handy low cost item for trailering. Get a 4 wire extension too. This allowed me to make quick checks on my truck wiring. Appears to be a good quality item. I strongly recommend getting a 4 wire trailer extension wire setup (maybe 48 inches or so, depends on your vehicle) so you can make solo tests from the driver’s door as you use turn signals, brakes, etc. You can just hang the tester near the back of the car or truck with masking tape. In addition test the running lights, turn signals and brake lights while the 4 way flashers are on, just to be sure…
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