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Message: <blockquote data-quote=".Mike" data-source="post: 444226" data-attributes="member: 22637">Lot's of people trying to help on this one. I'll try to try, too.You stated that according to someone else:  A voltmeter, applied to the Brown wire output showed only (.6 volts) when the outage was occurring.You need to measure the voltages yourself. When the problem is occurring, measure both the output, and the input immediately proceeding the black box. You might want to use a variety of ground points-- the one the black box is using, a metal part of the van, and a bare spot on the trailer.If the input is 12v and the output is 0.6v, the problem is a defective box or an improper installation. If the input is 0.6 and the output is 0.6, the problem is with the vehicle.If you determine the problem is related to the box, and you have tested two separate boxes with the same failures, then KMixson posted the likely solution:</blockquote>