Does 2025 Chevy Silverado 3500 Use Smart Diodes or Extra Diodes
Updated 08/24/2026 | Published 08/21/2026
Question:
I have a 2025 Chevy 3500 duramax, that I purchased the wiring diode kit to flat tow from you guys, you sent me with a 4 diode kit. When I had the installer that you recommended install it. He stated they were LED bulbs, and they needed the roadmasters smart diode. They have installed it, but it has not working. It appears to be connected correctly. Theres voltage coming to the diodes and going out the diodes, but the lights do not work. Is this the right setup? Or is there something new
asked by: David D
Expert Reply:
Hey David, sorry to hear about your issue but its actually because your truck requires two more additional diodes than what the # RM-15267 you had installed requires. So you'll need the part # RM-792 as well and you'll wire everything up like the diagram that I attached. I can't find anything from Roadmaster that Indicates that your vehicle would ever need the smart diodes.
(click to enlarge)
Expert Reply:
Hey David, sorry to hear about your issue but its actually because your truck requires two more additional diodes than what the # RM-15267 you had installed requires. So you'll need the part # RM-792 as well and you'll wire everything up like the diagram that I attached. I can't find anything from Roadmaster that Indicates that your vehicle would ever need the smart diodes.
Product Page this Question was Asked From
Roadmaster Smart Diodes for Variable Voltage LED Tail Lights - Qty 2
- Flat Tow Wiring Harness
- Splices into Vehicle Wiring
- Diode Kit
- Universal Fit
- Roadmaster
more information >
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on Flat Tow Wiring Harness
David D.
8/24/2026
My truck uses only 1 wire for tail light, brake light and turn signal. Apparently it is something call Ed multiplex wiring