Towbar - battery power lead

Audiman said:

I've got a golf mk5 2004 TDI, I'm trying run a power supply from the battery to the rear quarter in order to fit a towbar - running the cable through the car.
I can't figure out how to thread the power cable through the car.
I've tried threading the cable through existing rubber grommets but can't seem to see the other end of the cable.
Is there a best route to take ?

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Mongler98 said:

If your just hooking up a 4 pin connector, just piggyback off the tail lights and turn signals. No need to run power from the battery.
Are you running a trailer break?

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Ol'Rattler said:

Bad idea. Mark 5's use something called PWM https://en.wikipedia.org/wiki/Pulse-width_modulation in the brake running light and stop light circuits so you can get 2 different brightnesses from a single filament. Hooking directly into the cars wiring may not work correctly or might light up the bad bulb warning light.
Better to get one of these: https://www.etrailer.com/t1-2004_Volkswagen_Jetta.htm and use the cars wiring to trigger the respective trailer lights. I tapped power off of the in trunk power receptacle which is Fused and switched off with the ignition so there is no chance of the converter module running down the battery.

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