RC Pilot Posted November 21, 2016 Share Posted November 21, 2016 Picked up a 13 Impreza about a week and a half ago. Ordered a hitch and wiring harness for it. The wiring harness requires a power wire be run to the battery. My question is this; is the stock wiring so bad it cannot handle the addition of a couple trailer lights? If one of you have installed a power trailer harness, where did you run the wire? There seems to be no good way to run it underneath without much of it being exposed and I do not really want to drill a hole in the body to rin it inside. I tried to ask this wiring harness issue of Subaru America and the only answer I can get from the useless people in their customer service department is that they do not recommend towing anything with the Impreza. The warning not to tow with the Impreza turns out to be in the XV section of the manual which I did not look at prior to purchase as it is not an XV. They are at a total loss when I inform them that the same vehicle is rated to tow 2400lbs in some other countries and just start repeating the do not tow BS. Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 22, 2016 Share Posted November 22, 2016 Is the harness aftermarket? The only reason for needing power from the battery would be if you have trailer brakes and you need a charge wire for the breakaway battery on the trailer. Normally I do not run those directly to the battery, I use power for a rear outlet or some other switched supply that is only hot when the key is on so the trailer battery doesn't drain the vehicle battery for various reasons. Link to comment Share on other sites More sharing options...
RC Pilot Posted November 22, 2016 Author Share Posted November 22, 2016 (edited) The trailer harness is after market. The powered converter is not a brake module. Its maker says it is powered to keep from overloading the vehicle wiring harness. Just looking for how someone has run the power wire. Sadly, no rear power outlet to tap into. Edited November 22, 2016 by RC Pilot 1 Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 22, 2016 Share Posted November 22, 2016 Hmm, alright. Best thing would be to tap into the fuse panel inside if you can. Run power from something that's switched rather than direct to the battery. That will prevent battery drains if something in that module fails. Link to comment Share on other sites More sharing options...
RC Pilot Posted November 26, 2016 Author Share Posted November 26, 2016 Might pull the interior panels off and see if the wiring harness as the trailer connector tucked away. Reason being, got my hand on a factory wiring diagram it seems to indicate the harness is the same on the Impreza and the XV. If that is the case, I should be able to order the XV trailer harness and all will be well. Link to comment Share on other sites More sharing options...
keith3267 Posted November 26, 2016 Share Posted November 26, 2016 You could put LEDs in the trailer, then the cars harness would never feel the load of the trailer lights. But you would need a simple harness adapter and not one that uses relays. Link to comment Share on other sites More sharing options...
RC Pilot Posted November 26, 2016 Author Share Posted November 26, 2016 My trailer, small boat, has LEDS. If I pull the interior panel and do not find the XV plug tucked away I will probably just put her back on the lift and sort out the routing for the wire. If it does have the plug, I will just order an XV trailer harness. Link to comment Share on other sites More sharing options...
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