What do I need to test the voltage on a trailer harness?
tester needed to check voltage coming out of car going to 2 lite trailer?
Wade_
Expert
Any basic volt-meter that will read DC volts should suffice. Generally you should read 12volts (actually battery voltage) on the brake light lines when brake is depressed. On the parking like (tail light) lines you should read battery voltage when the lights are on. On the blinker lines you will read a very quick spike of voltage that is almost impossible for a digital meter to pick up, but you can see that the voltage is jumping to know you're getting voltage to those lines.
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