【7 Blade & 4 Pin Tester】 MECMO 2-in-1 Towing Vehicle Trailer Light Socket Tester includes both 4 way circuit tester and 7 way trailer plug tester. Universal fits for most truck, helps quickly identify lighting problems of your vehicle end 4-flat and 7-way trailer circuit connectors.
【6 Diagnostic LED Indicator】Design with easy-to-read LED light illuminate to test trailer light wire circuit status: confirm the functionality of your vehicle's trailer wiring harness’s brake lights, turn signals, taillights, stop, reverse, electric brakes, and 12V (auxiliary power).
【Red LED Identification Indicators】 MECMO 4 way and 7 way trailer plug tester with indicator diagnostic LED (Red lights) easy-to read signal makes it easy to know if you have a safe vehicle-side trailer wiring connection.
【Built to Last】 Excellent waterproof dual way 4 flat and RV 7 blade trailer light tester is made of reinforced ABS plastic, results in a seamless qualitative look. Brass and tin-plated copper terminals provides well-protection, great corrosion-resistance and conductivity.
【Plug and Play】7 pin tester plug into your 7 way RV standard car end socket, and the 4 pin flat side tester plug into your vehicle-side 4-prong T-connector harness or 4 wire taillight connector. Simply and effectively test your trailer light harness.
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When you plug this in on GMC PICK UP the LED lights are facing down and unreadable . The groove on 7 pin plugs on GMC are on the bottom. So this unit will not be usable on GMC pick ups. I will be returning it.
I found the unit quite snug but it worked. When you remove it from the truck hookup, hold the hookup against the truck so that you don't pull the whole thing out of the bumper! The swivel was definitely needed. For horizontally installed harnesses, the LEDs point down so you need to spin the tester. It would be helpful if the 4 prong side also swiveled. Still, 5 stars!
Price was right, delivery was prompt and I like the twist feature that allows you to see the lights from any angle but it didn't work in my 2022 Silverado. Talked to my mechanic and he said the LED lights in the tester were too sensitive and they all flashed at once making it useless.
When you plug this in on GMC PICK UP the LED lights are facing down and unreadable . The groove on 7 pin plugs on GMC are on the bottom. So this unit will not be usable on GMC pick ups. I will be returning it.
When you plug this in on GMC PICK UP the LED lights are facing down and unreadable . The groove on 7 pin plugs on GMC are on the bottom. So this unit will not be usable on GMC pick ups. I will be returning it.
Works just like I expected. I choose this unit because my truck has the keyway on the bottom of the plug so I needed to be able to rotate the LEDs to face up. I only wish there was better marking for indicating what each LED indicated. The printing is small and is simply molded into the plastic thus it is hard to read, especially in bright sun light. DF - Napa 7-9-24
I was surprised how well this worked. I have a GMC pickup and most readers would show at the bottom rather than the top. This one twists so you can turn it so the readings face up. Works very well.
5.0 out of 5 starsTake reviews with a grain of salt!
Reviewed in the United States on March 15, 2025
Verified Purchase
Some people shouldn’t be able to write reviews. This tester is rotatable. So people saying it is blocked by the lid are who I’m speaking of. You can rotate it 180°