2000 E450 Class C Brake Controller
So I purchased this unit last year and have been unable to determine my problem. I am thinking I have a short some where, but here it goes. Under the dash near the emergency brake are two connector...
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You have an open ground. Probably on the trailer, but double check the plug on the RV too. The 4-volts at the brakes are due to the marker lights returning through the brakes wiring. I had this same problem (albeit intermittent) this weekend.
