The RBE TH21-S Testers reduce the maintenance costs of testing lighting circuits, because with this tester you actually get two testers for the price of one: a tractor to trailer signal tester and a trailer light circuit tester. The TH21-S Testers also improve and speed-up the light testing process by providing the capability to quickly check both the tractor and trailer. Got a lighting problem in your rig? First check the tractor signals with the tester. If the problems not there, now troubleshoot the trailer with the tester. You can’t beat that for being versatile, fast, and effective. The TH21-S will save you time and money.

The TH21-S Tester is designed with heavy duty test switches, 20 Amp auto reset breaker, short circuit indication and is provided with reverse voltage protection. Lighting circuit signals are displayed by super bright long life indicators. The indicators are signal level sensitive and change intensity level with high resistance connector pin conditions or high resistance circuit conditions. The Testers include an amperage meter and turn signal flasher. The Testers are packaged in an attractive, tough black plastic carrying case with storage for cables and include heavy duty battery clamps, a rugged metal 7 pin connector and complete test instructions. The Testers can be used with either battery charger or battery.

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RBE Vehicle/Trailer Testers Benefits and Features