Negative Positive
Title: works well
Review: I was getting just over 9 volts to the brake lights at the trailer connector on my motorhome before I installed this unit. After install, over 13 volts. Install was sraight forward. I'm sure the #12 wire supplied would have been more than adequate, but I had # 8 left over from another project, so I ran #8 power and ground 30 ft from the battery to the rear of the rig. I also used a circuit breaker instead of the fuse. This unit greatly reduces the load on the vehicles problematic turn signal and brake switches as well.
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