Solution To Allow 12 Volt Accessory Circuit to be Active on 2019 Mercedes Sprinter

Question

Question:

I have an RV on a 2019 Mercedes Sprinter Chassis. I am trying to troubleshoot power issues to my towed battery charger, specifically the voltage on pin 4 which should be 12V. However I cannot read any voltages on the 7-pin connector with a multimeter, I think due to the lamp out sensor disabling the pins. Will the 20142 allow me to read voltage?

asked by: Steve H

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Expert Reply:

The 7-way to 7-way lamp out adapter # 20142 would work for your 2019 Mercedes Sprinter to prevent the sensor issue you are experiencing. We've had customers with Sprinter vans like yours and they reported that this fixed the issue.

expert reply by: Jameson C

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Answer 1

Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at…

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Answer 2

If Mercedes installed the factory brake controller harness on your 2016 Mercedes Sprinter Motorhome, it would be under the driver's seat. It would have a green connector. If the harness is not under the seat, then from our experience, it was…

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Answer 3

When the LED light on the Curt Echo part #C51180 does not illuminate that means the brake controller is not getting power from the 12V pin or the ground is bad. On a 7-way trailer connector, the 12V power function does not need to be connected for…

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Answer 4

It sounds like it may be a fuse issue. After researching the 2016 Mercedes Sprinter Manual on-line, I was able to track down the fuse box. It's located in the footwell on the left-hand side of the vehicle. If your fuses check out fine, I would…

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Answer 5

The blue light on the LED indicator of the Curt Echo Brake Controller part #C51180 that you referenced indicates that the controller is paired to a phone but a trailer is not connected. See attached picture that shows what all of the colors indicate.…

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Answer 6

I do believe you're asking how to determine whether or not your RV has a combined or separate lighting system. If the motorhome’s trailer plug energizes the same pins on the 4 way connector for both brake lights and turn signals, then a 3-to-2…

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Answer 7

I have added a photo detailing the wiring connections for the Pollack Heavy-Duty, 7-Pole, Round Pin conncetor, #PK11700, see link. This is a SAE J560 compliant connector. The wiring diagram for the vehicle side connector, #PK11720, is pictured also.…

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Answer 8

To see a couple diagrams that show how the 6-way to 7-way adapter part #47435 is wired up check out the pictures I attached. The 6-way of this adapter has the center pin as the 12 volt circuit. That is the usual circuit that gets moved around on…

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Answer 9

To determine the wire functions on the trailer side 6-Way connector you have a couple of options. First, you can trace each wire back on the trailer to see where they go. Depending on how the wiring is routed on the trailer this could be easy or…

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Answer 10

Usually a 4-pole trailer connector will have a white wire as ground, green wire for right turn/stop, yellow wire for left turn/stop and brown for both sides' running lights. But since there is no real standard for wire color on trailers (and…

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Answer 11

It sounds like you have a 7-way blade connector on your boat trailer as that is a very common connector on boat styles. This connector has 6 pins around the outside of the connector and a center pin for a total of 7. Part #A7WCB would be what a 7-way…

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Answer 12

If it was a 4-pin connector with 5 wires then it is called a wishbone harness and would have 2 wires attached to the running light pin so you have one wire for each side of the trailer. Typically, on a 4-Way, the white wire is ground, brown is…

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Solution To Allow 12 Volt Accessory Circuit to be Active on 2019 Mercedes Sprinter

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