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<blockquote data-quote="JoeJ" data-source="post: 1539484" data-attributes="member: 254143">Ok, my first thought is that it is a bad ground, and i browsed through several questions here in which people had suggested bad ground, so that&#039;s probably the problem. It is a four wire system.&nbsp; My question is do you have to have BOTH the truck side wiring harness AND the boat side harness grounded, or will one suffice?&nbsp;&nbsp; Here&#039;s what i found:It looks like in the wiring harness on the truck side, that the ground wire is cut.&nbsp; I thought that if i hooked the trailer side harness ground wire securely to the truck chassis that it would work, but it didn&#039;t... do BOTH ground wires need to be grounded for it to work?&nbsp; I thought that as long as the circuit has a ground (no matter from which side) it would work.&nbsp; Am i wrong?Thx for any help.ALSO:&nbsp; Do the tail lamp assembly&#039;s HAVE to be grounded as well for this to work?&nbsp; (i was doing some testing by just wiring the new lamp assemblys up to the harness and not attaching to trailer).&nbsp; If they have to be grounded as well, this is just accomplished by bolting them to the trailer, correct?</blockquote>

[QUOTE="JoeJ, post: 1539484, member: 254143"] Ok, my first thought is that it is a bad ground, and i browsed through several questions here in which people had suggested bad ground, so that's probably the problem. It is a four wire system. My question is do you have to have BOTH the truck side wiring harness AND the boat side harness grounded, or will one suffice? Here's what i found: It looks like in the wiring harness on the truck side, that the ground wire is cut. I thought that if i hooked the trailer side harness ground wire securely to the truck chassis that it would work, but it didn't... do BOTH ground wires need to be grounded for it to work? I thought that as long as the circuit has a ground (no matter from which side) it would work. Am i wrong? Thx for any help. ALSO: Do the tail lamp assembly's HAVE to be grounded as well for this to work? (i was doing some testing by just wiring the new lamp assemblys up to the harness and not attaching to trailer). If they have to be grounded as well, this is just accomplished by bolting them to the trailer, correct? [/QUOTE]

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