Enclosed Trailer Interior Lights Don't work

ob_1jr · 09-27-2005, 06:24 PM

Well, I have had this problem since I owned my truck. I have tried the truck on 2 different trailers. Problem is the interior lights don't work. They should work off the Aux power pin on the plug. Is there a fuse that controls this? Also, I remember reading on here a while back about someone having a problem with their trailer wiring. I think they figured out that there was a fuse that wasn't installed from the factory. The only thing one that wasn't installed from the factory on my truck is the one that is next to stud 1. (#1 in owner's manual) The manual states Auxilliary Power (single batterys and Diesel only)/Dual Battery (TP2) do not install fuse. So, do I install a fuse here or not. I have a Diesel with dual batteries. Also, I was just using a test light on my plug and I didn't have power on the positive or negative posts (checked each to ground with a test light not to each other). Any help or expertise would be greatly appreciated.

Max Power · 09-27-2005, 06:31 PM

If you install the fuse on that stud 1 it will solve your problem.

DavesDmax · 09-27-2005, 06:39 PM

What Max Power said.

Remove the blank, install the 40 AMP fuse that came with the trailer controller harness, (the fuse is buried in the middle of the bundle). That supplies power to the trailer charge curcuit, (or trailer house power, if you will).

ob_1jr · 09-27-2005, 07:22 PM

Thanks for the quick reply. I will do that..I thought I read it somewhere here on the forum, but I couldn't narrow down the search enough.

Joe Pool · 09-28-2005, 08:27 AM

Try your trailer interior lights with the trailer connected to the truck (plugged in) and your parking lights turned on, I had a Pace trailer that required the parking lights to be turned on to operate the interior lights. Maybe your trailer is wired the same way.

Joe

ob_1jr · 09-28-2005, 03:07 PM

Quote:

Originally Posted by Joe Pool

Try your trailer interior lights with the trailer connected to the truck (plugged in) and your parking lights turned on, I had a Pace trailer that required the parking lights to be turned on to operate the interior lights. Maybe your trailer is wired the same way.

Joe

Been there done that. Your pace trailer has the 4 flat plug on it doesn't it? That is the way my old interstate trailer was. This trailer came with the 7 round plug and electric brakes. I haven't installed the fuse yet to check it out, but I am sure that will fix it. Thanks for the reply though.

DavesDmax · 09-28-2005, 08:30 PM

Quote:

Originally Posted by ob_1jr

Thanks for the quick reply. I will do that..I thought I read it somewhere here on the forum, but I couldn't narrow down the search enough.

You're welcome.

Joe Pool · 09-29-2005, 05:44 AM

No, the Pace had a 7-way round RV plug and brakes as well.

Joe

ob_1jr · 09-29-2005, 05:41 PM

Maybe...I still didn't have the fuse on stud 1 installed. I need to go find one at the auto parts store to find out. I don't know if, once installed, those 2 pins would have power without the lights on....it would make sence that it doesn't. I will know just as soon as I pick up that fuse though.

Max Power · 09-29-2005, 05:50 PM

There is a shunt you need to remove first. It is red plastic and shaped like a fuse. There is also a small possibility that the ring terminal isn't on the stud under the cover. You can take the cover off and have a look if you like.

09-27-2005, 06:24 PM	#1
ob_1jr Diesel Master Join Date: Jul 2004 Location: Eielson AFB, Alaska Posts: 1,423 Garage: active iTrader: (0) ALCAN Diesel Place Chapter Member Armed Forces Club Member	Enclosed Trailer Interior Lights Don't work Well, I have had this problem since I owned my truck. I have tried the truck on 2 different trailers. Problem is the interior lights don't work. They should work off the Aux power pin on the plug. Is there a fuse that controls this? Also, I remember reading on here a while back about someone having a problem with their trailer wiring. I think they figured out that there was a fuse that wasn't installed from the factory. The only thing one that wasn't installed from the factory on my truck is the one that is next to stud 1. (#1 in owner's manual) The manual states Auxilliary Power (single batterys and Diesel only)/Dual Battery (TP2) do not install fuse. So, do I install a fuse here or not. I have a Diesel with dual batteries. Also, I was just using a test light on my plug and I didn't have power on the positive or negative posts (checked each to ground with a test light not to each other). Any help or expertise would be greatly appreciated. __________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7 4" turbo back MBRP exhaust, Cognito UCAs & HD tierods TST Powermax Programmer, Diablosport Predator 285/75-16 BFG T/A KOs on Eagle Alloys Series 187 Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks Extang Classic Platinum Tonneau Cover Magnum Force Stage 2 Proguard 7 intake Racor 2 Micron pre-OEM with heater & water sep.
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09-27-2005, 06:31 PM	#2
Max Power Diesel Laureate Join Date: Sep 2003 Location: Manitoba, Canada Posts: 14,720 Garage: active iTrader: (3)	If you install the fuse on that stud 1 it will solve your problem. __________________ New Toy 2009 GMC Crew Cab, Short Box SLT LMM. Let the games begin! 04.5 GMC 2500HD LLY Carbon Metallic - Sold 2003 GMC 2500HD LB7 White - Sold
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09-27-2005, 06:39 PM	#3
DavesDmax Diesel Fanatic Join Date: Sep 2003 Location: Fremont, Ohio Posts: 986 iTrader: (0)	What Max Power said. Remove the blank, install the 40 AMP fuse that came with the trailer controller harness, (the fuse is buried in the middle of the bundle). That supplies power to the trailer charge curcuit, (or trailer house power, if you will). __________________ Dave 2004 Chevy 2500HD,CC,LWB, LT,D/A-LB7,4WD,Sport Red,NASTA Step Bars,Line-X over the rails,Access RT cover,Fumoto,Racor 660 Pre-OEM,Delvac 1 Engine, Mobil 1 Gear Lube,Transynd, ISSPRO gauges, Rancho RSX9000's 12,000 miles in 24 Months - The Driveway Queen! 2003 Trail-Lite 8305S, A light weight at 6100lbs and 32Ft. Prodigy Brake Controller Extra toys and tools from Eric at www.gmdieseltech.com
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09-27-2005, 07:22 PM	#4
ob_1jr Diesel Master Join Date: Jul 2004 Location: Eielson AFB, Alaska Posts: 1,423 Garage: active iTrader: (0) ALCAN Diesel Place Chapter Member Armed Forces Club Member	Thanks for the quick reply. I will do that..I thought I read it somewhere here on the forum, but I couldn't narrow down the search enough. __________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7 4" turbo back MBRP exhaust, Cognito UCAs & HD tierods TST Powermax Programmer, Diablosport Predator 285/75-16 BFG T/A KOs on Eagle Alloys Series 187 Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks Extang Classic Platinum Tonneau Cover Magnum Force Stage 2 Proguard 7 intake Racor 2 Micron pre-OEM with heater & water sep.
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09-28-2005, 08:27 AM	#5
Joe Pool Diesel Fanatic Join Date: Sep 2003 Location: Valles Mines, Missouri Posts: 87 iTrader: (0)	Try your trailer interior lights with the trailer connected to the truck (plugged in) and your parking lights turned on, I had a Pace trailer that required the parking lights to be turned on to operate the interior lights. Maybe your trailer is wired the same way. Joe __________________ 2002 Chevy 2500HD LT D/A CC SB 4x4(dual alts/Nicktane/Mich 265s/Xenarc headlights/Line-X/TTT mirrors/DTA boards/...) 2002 Dodge CTD 4x4 (Line-X/Fisher EZ Vee plow/...) 2001 Dakota Quad Cab Sport 4x4 1967 Kaiser M715
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09-29-2005, 05:44 AM	#8
Joe Pool Diesel Fanatic Join Date: Sep 2003 Location: Valles Mines, Missouri Posts: 87 iTrader: (0)	No, the Pace had a 7-way round RV plug and brakes as well. Joe __________________ 2002 Chevy 2500HD LT D/A CC SB 4x4(dual alts/Nicktane/Mich 265s/Xenarc headlights/Line-X/TTT mirrors/DTA boards/...) 2002 Dodge CTD 4x4 (Line-X/Fisher EZ Vee plow/...) 2001 Dakota Quad Cab Sport 4x4 1967 Kaiser M715
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09-29-2005, 05:41 PM	#9
ob_1jr Diesel Master Join Date: Jul 2004 Location: Eielson AFB, Alaska Posts: 1,423 Garage: active iTrader: (0) ALCAN Diesel Place Chapter Member Armed Forces Club Member	Maybe...I still didn't have the fuse on stud 1 installed. I need to go find one at the auto parts store to find out. I don't know if, once installed, those 2 pins would have power without the lights on....it would make sence that it doesn't. I will know just as soon as I pick up that fuse though. __________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7 4" turbo back MBRP exhaust, Cognito UCAs & HD tierods TST Powermax Programmer, Diablosport Predator 285/75-16 BFG T/A KOs on Eagle Alloys Series 187 Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks Extang Classic Platinum Tonneau Cover Magnum Force Stage 2 Proguard 7 intake Racor 2 Micron pre-OEM with heater & water sep.
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09-29-2005, 05:50 PM	#10
Max Power Diesel Laureate Join Date: Sep 2003 Location: Manitoba, Canada Posts: 14,720 Garage: active iTrader: (3)	There is a shunt you need to remove first. It is red plastic and shaped like a fuse. There is also a small possibility that the ring terminal isn't on the stud under the cover. You can take the cover off and have a look if you like. __________________ New Toy 2009 GMC Crew Cab, Short Box SLT LMM. Let the games begin! 04.5 GMC 2500HD LLY Carbon Metallic - Sold 2003 GMC 2500HD LB7 White - Sold
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