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hello, thanks for posting
Electrical issues can be a bit difficult to solve here but let me give it a try, there is obviously a short circuit to ground causing the fuse to blow, which I assume is the 'tail'fuse located in the inside fuse box,
First disconnect both wire harnesses to both tail light assemblies, turn the headlights on, does the fuse still blow?
If yes, the short is further to the front, if not the problem is in one of the light assemblies, the problem can also be caused by a faulty towing hitch wiring, so if it has a towing hitch please let me know.
If further diagnosing is needed a volt/ ohm meter would be a great help. let me know how this goes for you.
Thanks for the reply
I just realized that you said it had a towing package in your first post, if the fuses still blow try disconnecting the towing harness from the chassis harness and see if it fixes it, if it does you most likely need to replace the towing electrical converter box or possibly have it redone, depends on what system it has aftermarket or factory.
Thanks for the update
Yes the license plate lights are on the same circuit so they could be the cause as well. Go ahead and use the connector cleaner. If it's not the license lights go to the front of the car and disable tha parking light/ side marker lights, they are also on the same circuit.
Ok, let's see if we can avoid doing all of that, I think you can reach in from behind to get to the connector and unplug it if not, let me know. Is the tail fuse the only one that blows? Does it blow as soon as the headlight switch is turned on or before?
I understand, does it have fog lights, they are also on the same fuse, also try to remove the tail light relay under the hood and see if the fuse stays intact.
Great, looks like you have found the problem, the white/black wires are ground the other green wires should not be grounded
Ok, keep me posted.