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<p>[QUOTE=&quot;Cordel1, post: 12291882, member: 205470&quot;]Hello, I drive a 2005 ish T800 day cab, heavy spec. I am wondering how the truck ECM may communicate if at all with trailer ABS. The trailer ABS light located on the upper dash by the ceiling comes on when connected to a 2 year old MAC gravel train. The ABS light on the trailer is on as well, so I know that there is an issue on the trailer that also needs to get addressed.&nbsp; I&#039;m just wondering if the two communicate at all. When I connect to a non ABS trailer the truck light goes out. </p><p>We did learn that the 30A fuse located in the truck fuse panel labeled &quot;trailer hot line&quot; is not connected through the center pin on the 7way. The center pin is powered by a the fuse labeled &quot;trailer ABS&quot;, I can&#039;t remember for sure, but I think that is a 5A fuse. </p><p>I&#039;m just basically curious if the truck brain is smart enough to sense trailer issues. </p><p><br /></p><p>Thanks!</p><p>Cordel1[/QUOTE]</p><p><br /></p>

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