What 2015 Chevy Silverado 3500 Fuse is for AUX Pin on 7-Way Socket
Updated 01/03/2025 | Published 01/01/2025
Question:
I have a 2015 Chevy 3500 HD diesel 4wd crew cab long bed pickup not a dually and I cannot get the interior lights on my enclosed trailer to work. The auxiliary in n the 7 pin hookup has no power to it and I am not sure from the owners manual which fuse controls this blade.
asked by: Dave G
Expert Reply:
Hey Dave, thanks for reaching out!
I wasn't able to find the fuse for the AUX pin on your 7-Way either, but we still might be able to get your trailer interior lights back up and working.
A lot of times the interior lights of a trailer are tired to the 12V power pin and connected either directly to that pin on the trailer plug, or to a battery in the trailer. Try checking fuse 2 in the engine bay fuse compartment and making sure you have power to that 12V pin (in the 1 o'clock position - see photo).
If that looks good and has power to that pin and you can verify your trailer interior lights do pull power from the AUX pin, then I recommend looking at all of the fuses in the "miscellaneous" and "spare" positions. You might be able to get a local Chevy dealer to recommend a pin, but they typically read it out of the manual so I'm not entirely confident that will help you out.
You can also try hooking the trailer up to a vehicle with a 7-Way that has a known working AUX pin to verify if that's the problem.
Let me know what you find out in the comment section below!
(click to enlarge)
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Dave G.
1/3/2025
Thanks, Jon. It turns out that it was the 30 amp fuse 2 that was burned out. It would be nice if GM would have noted that it's the auxiliary trailer power.