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I have seen two different T-connectors. One has a "circuit protected Modulite" and you have to run a positive wire to the battery. The other doesn't. Do I actually need a circuit protected wiring harness?
 

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I don't see why you would. I've never had a vehicle with one that is circuit protected. I'm sure it's just a way of making a little more money. The regular harness will be tied into the taillights fuse anyway, so technically it will be circuit protected regardless.
 

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If the fuses for the taillights were between the Body Control Module and the lights then you could rely on the fuses. But they aren't and I would get an isolation module just to keep the trailer from affecting the car electronics.
 
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