trailer lights and wiring problems

[calitundra]

I have a 2000 tundra access cab 4x4. When I used my trailer last year I had no problems. I had asked the dealer if the tsb for the trailer harness was done on the truck before I bought it. I was told it had been. This year when I hooked up the trailer I noticed that the running lights were not working, but everything else was. I dug around and found the fuse on my trailer to the running lights had blown. I replaced it but still could not get it to work. Tracing backwards I found that the green wire at the factory plug is not supplying power although the lights on my truck work fine. I ended up running power from the trailer battery to the trailer lights to drive it at night. Therefore I know the wiring on the trailer is ok. I did not see any blown fuses or other obvious problems. My question: Is there a fuse for the trailer wiring on my truck? Would not doing the TSB as the dealer stated they had cause this problem and if so is there a way to tell the new wiring harness from the old. Also my truck has an additional fuse on the drivers wheel well that I believe is part of an additional trailer fcn. Does anyone know the use of this and where the wires end? My workshop manual does not list this.

[nhparrot]

Originally Posted by calitundra

I have a 2000 tundra access cab 4x4. When I used my trailer last year I had no problems. I had asked the dealer if the tsb for the trailer harness was done on the truck before I bought it. I was told it had been. This year when I hooked up the trailer I noticed that the running lights were not working, but everything else was. I dug around and found the fuse on my trailer to the running lights had blown. I replaced it but still could not get it to work. Tracing backwards I found that the green wire at the factory plug is not supplying power although the lights on my truck work fine. I ended up running power from the trailer battery to the trailer lights to drive it at night. Therefore I know the wiring on the trailer is ok. I did not see any blown fuses or other obvious problems. My question: Is there a fuse for the trailer wiring on my truck? Would not doing the TSB as the dealer stated they had cause this problem and if so is there a way to tell the new wiring harness from the old. Also my truck has an additional fuse on the drivers wheel well that I believe is part of an additional trailer fcn. Does anyone know the use of this and where the wires end? My workshop manual does not list this.

see attachment

There should be a fused connector in the engine bay called the O3 connector. On the 2001 Models, it runs from the battery to a connector on the firewall.

[nhparrot]

Originally Posted by nhparrot

see attachment

There should be a fused connector in the engine bay called the O3 connector. On the 2001 Models, it runs from the battery to a connector on the firewall.

Checked my repair manual on the '00 the O3 connector is on the driver front fender wall.