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Q: Does the testerwork wothout the trailer being attached?

Yes. You can utilize the tester to test the tow vehicle side of connection without the trailer attached to it. Hope this helps.

Q: Does it work on bulbs that aren't LED

Yes - This is testing your wiring, not your bulbs. The only reason the description mentions LEDs is because the indicator lights on the tester are long lasting LED.

Q: tried this today, when I turn on the left or right directional all the lights light up on the tester? is it supposed to be all lights?

Only one LED will light showing left or right or tail lights. Sounds like you have a wiring problem in the vehicle's wiring to the connector. I would check the ground connection for good continuity to the auto frame. An 'open' ground would allow all lights to light as you describe. You could verify that the tester is ok by trying it on another vehicle, too.

Q: Why are all three lights on when connecting the trailer and car? Lights arent working on the trailer and the tester works when only connected to the c

it shows there is electric to that poin not thoughtto th blubs on thr trailer

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Does the testerwork wothout the trailer being attached?

Does it work on bulbs that aren't LED

tried this today, when I turn on the left or right directional all the lights light up on the tester? is it supposed to be all lights?

Why are all three lights on when connecting the trailer and car? Lights arent working on the trailer and the tester works when only connected to the c

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Rain smaller Adapter TT183

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