Troubleshooting 4-Way Wiring Splicing On 2015 Mercedes-Benz Sprinter

Question:

all functions work on the spliced in 4 pin powering an LED light strip except the tail lights. Sprinter wire spliced for tails is the BR. Any ideas?2015 Mercedes-Benz Sprinter

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Expert Reply:

The system on your 2015 Mercedes-Benz Sprinter is a 3 wire system instead of a 2 wire system for a trailer. I recommend using the trailer wiring kit # 119190KIT to give you the conversion as well as a powered system so your wiring is not overloaded.

To allow you the wiring you desire without the powered modulite, I recommend the Vehicle to Vehicle Tail Light Converter # C56196. This will take your separate system and combine it appropriately for trailer light functions.

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Jason S

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Question:

Thank you, I should have said that the 4 pin vehicle plug I spliced in just forward of the Sprinter 7 pin plug is to power a Pacer, Outback,F5, LED strip. As spliced, all functions on the strip work except the tail lights. The strip works correctly when plugger into the 7 pin via an adapter. My goal is to keep the spliced strip plug hidden behind the bumper. Any idea why the Sprinter brown wire to the 7pin when spliced into for the 4 pin doesn’t power the F5’s tail lights?

asked by: George

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Expert Reply:

Since everything works when you plug into the 7-way using an adapter, the issue is most likely because it is an LED unit. LED's don't often pull enough draw for some functions to work properly, so using the adapter actually helped in this case causing more of a draw.

To put the functions behind the bumper, I recommend you use the Putco LED Light Bulb Load-Resistor Kit - Aluminum # P230004A in line with your splicing on the brown running light wire. This resistor will create the draw needed for the light to function properly.

expert reply by: Jason S
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Jason S

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