I have a 2008 Tacoma, I plugged in my trailer and lost my running lights or parking lights (tail), found a short in the trailer lights,resolved that...blew a fuse on the tail lights, changed it still no lights. Checked the fuse with a meter good. Still no parking lights..front and back ??

sounds like a fuse. the main fuse box sould be located under the steering weel.

It sounds as though you have either a frayed wire between the brake control circuit and tail/running light circuit of the truck side of the plug, or someone wired the truck side of the plug incorrectly.

Think about it. The parking brake lights come on when the controller is activated. More than likely the tail lights are also.

The tail lights are also going to come on when the headlights are on. This would cause the trailer brakes to be activated IF there is a short in the TRUCK side of the plug itself.

That's where I would personally start investigating, The truck side of the trailer plug.

Hope this helps.

you have a short. you will need a wiring diagram and some know how to find it. check the tail lights and anything that isnt factory installed (trailer harness???)

your vehicle has a "integrated power module". its a fancy name for a smart fuse box. What likely happened is there is a problem with the trailer wiring. The power module detected the fault and shut down the running lights. The power module will need to be reset at the dealer.

Fuse 15 is a 50 amp fuse for the park lamp relay
Fuse 32 and 34 are 10 amp fuses for the right and left park lights
Fuse 33 is a 10 amp fuse for the trailer park lights.

After it is reset I would not plug in the trailer until the fault is located and repaired.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The trailer tow adapter parking lamps is fuse #10 in the cab fuse panel. There is also a trailer tow parking lamp relay that powers them, which could have a problem as well.
Start with the fuse, and maybe check both the 7 pin and the 4 pin for the parking lamps, could be a corroded pin on one of them causing the tester to not see the power on the pin.

Then you have a short circuit to ground in this tail lamp wiring which you need to find to stop the fuse burning out. Finding a shorted circuit may not be easy but you can try this, check your trailer electrical connection (if you have one) as these do cause this kind of issue. Faulty wiring to this connector, damage or lost screws can all result in this issue. You may need to follow the rear wiring harness from the cab back to locate anywhere that the wiring has been crushed or rubbed through insulation has occoured and the copper conductor is now touching the body or a ground wire. Check the trailer connector, rear wiring behind the lamp assemblies and the harness where it runs in the chassis. If you have recently has any work done under the vehicle, check this area too..

IT SOUNDS LIKE PROBLEM IS WITH TRAILER WIRING,NOT THE TRUCK..IF NOT BLOWING FUSE UNTIL YOU PLUG IN TRAILER,CHECK TRAILER WIRING FOR SHORTS IN WIRING,CHECK FOR CORRODED LIGHT SOCKETS,BAD GROUND CONNECTIONS..LET ME KNOW WHAT YOU FIND

Buy bulk wire and extend the harness, u will need **** connectors and a cheap crimping tool.

Look under the dashboard, next to/above the park brake pedal, for the interior fuse box. It has a black plastic cover. Remove the TAIL fuse, and see if it is blown. This should get you fixed up. Hope this helps, and Thanks for choosing FixYa.

Check the taillamp fuse on the truck. If it is blown, you either have a short in the wiring of the camper, or the 7 pin inverter box on the camper.