When I connected the tester to the mains, only one 12V light came on When testing the car's headlights, no other light came on except for the single one 12V power light even though I know the turn signals work when tested with another tester. All headlights were tested well with another tester except for the running lights, but this tester only showed a power light so it didn't work as advertised. I do not recommend buying this tester.
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