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Can I attach my trailer lighting module to the aux battery in the trunk?
What is your question?
Or do I have to attach the trailer lighting module to the main battery under the hood which means running a long lead from the front to the back of the car, something I want to avoid.
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If it's a normal 12 volt battery, you will be good. Make sure you have a relay so it's switched on when the car is running or the key is turned. You don't want the lights on all the time.
Alex