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Trailer Lamps

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Posted (edited)

A question for the Tech guys.

What is the difference between these two lamp circuits?


Location is under hood fuse box.


Fuse #54......10 amp listed as the "Trailer reverse lamp".


Fuse #55......10 amp  listed as the  " Trailer back-up lamp"


The trailer is a boat trailer with surge brakes and uses the the reverse to operate the master cylinder bypass solenoid to allow backing up.


I think it is the center pin in the 7 pin round  that supplies voltage to the backup solenoid.


Usually the trailer reverse light are tied in with the master cylinder bypass  solenoid and activated when in reverse.


I am adding reverse lights to the trailer and would like to know which fuse is it and is there any other loads on that fuse.


The short version of the  question is...how many watts can the reverse lights be before an overload on that circuit?


Thanks for any help.




Forgot.......2020 CCab,  LTZ,  6.2, max tow, standard bed , tech package with HU display.

Edited by Mike_F

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Posted (edited)

If you are adding LED reverse lamps to your trailer you are most likely not adding enough load to effect anything, typically a bypass solenoid will only draw .5 - 1 amp unless you are adding a 50" light bar you will be fine. with that 10 amp fuse you can get 120-130 watts before that fuse will pop. 

Edited by Greyhound6.2

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Thanks Greyhound6.2


The lights I added were not true DOT trailer backup lights, just led floods, so the watts are higher, hence my concern.


They are rated at 18 watts @ but when I checked them they pulled 1.2- 1.3 amps @ so the lumen output is probably less than stated also.


Connected and tested them last night and all seems well as I left them on for a 10 min. test .


Still curious what the two fuses listed above supply.


I could pull a fuse to see which one kills the trailer lights but still would not know what the other fuse supplies. 


Thanks again

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