What Tester Can I Use if my Vehicle Has Lamp Out Sensors

Updated 12/29/2025 | Published 12/08/2025

Products Featured in This Question

Pollak 7-Way to RV Socket LED Circuit Tester - Vehicle End

(156)

$43.47

Question:

Does PK12741 work with cars that have lamp out sensors. If not which 7 pole and 4 pole testers do you recommend. I understand I may need resistor-equipped adapter adding dummy loads to mimic bulbs

asked by: Billn

Expert Reply:

Hey, Bill!

You can definitely use tester part # PK12741 with your vehicle, but you’ll need one additional part to make it work properly with your vehicle’s plug. The part # 20142 adapter has a built-in bypass specifically for vehicles with lamp-out sensors, like your Sorento.

You’ll also want to use this adapter anytime you’re towing a trailer or plugging anything else into your Sorento’s 7-way, as it helps ensure everything functions correctly.

expert reply by: Gwendolyn Y

20142
(click to enlarge)

Gwendolyn Y.

12/29/2025

Hey Bill, how did things go using the tester with the adapter on your Sorento’s 7-way plug? Your update could make it easier for others with vehicles that have lamp-out sensors.