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Old 08-29-2013, 12:18 AM   #1
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Trailer Wiring--Clueless

I have a small cargo carrier that I am trying to connect the light array using an adapter to accomodate an 4-in-line plug to a round 4 pronger. I admit I am virtually clueless when it comes to electrical work, but I do know how to read and what I am seeing is to check the modulite with a circuit tester. Well, I have no idea where (or for that matter, what) the modulite is or the convertor box either in my 2004 Georgetown 370xl. Does anybody know where these things are so I can test them? Or even better run me through some trouble shooting procedure. I can't use this trailer without those lights that's for sure.
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Old 08-29-2013, 12:42 AM   #2
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Originally Posted by jimsaxman View Post
I have a small cargo carrier that I am trying to connect the light array using an adapter to accomodate an 4-in-line plug to a round 4 pronger. I admit I am virtually clueless when it comes to electrical work, but I do know how to read and what I am seeing is to check the modulite with a circuit tester. Well, I have no idea where (or for that matter, what) the modulite is or the convertor box either in my 2004 Georgetown 370xl. Does anybody know where these things are so I can test them? Or even better run me through some trouble shooting procedure. I can't use this trailer without those lights that's for sure.

Maybe this will help.
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Old 08-29-2013, 12:49 AM   #3
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Can you post a picture cause it sounds like its going to be a custom job by you..!
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Old 08-29-2013, 01:01 AM   #4
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I did this on our 2004 GT standard round 4 to flat 4 for our tow dolly using a commercial adaptor. I found the wires were mismatched. I took both apart and changed connectors on the GT side so they matched the connector. All is well.
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Old 08-29-2013, 04:53 AM   #5
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i found this tester very helpfull.
Four-Way Trailer Light Tester
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Old 08-29-2013, 06:23 AM   #6
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plug

a standard 4 pin plug wiring should be like the attached---found with bing search of "4 pin trailer diagram", search for power with brakes and turn signals on-off or with resistance checks.

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Old 08-29-2013, 08:08 AM   #7
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Don't forget to check the wiring ground on the trailer itself...that's the problem a lot of the time.

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Old 08-29-2013, 08:35 AM   #8
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Don't forget to check the wiring ground on the trailer itself...that's the problem a lot of the time.
Dave
X2 make sure the trailer ground wire is firmly connected to the trailer frame!
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Old 08-29-2013, 01:49 PM   #9
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Yes, the trailer ground wire is firmly connected to the frame. Thanks for the diagrams. Sure enough, my round plug looks like the one etcmss posted. Just went out and got a circuit tester (continuity [!] tester). Going to test the individual plugs and the dedicated fuses associated to see where that leads me. I also am entranced by the suggestion that the various circuits my be mis-wired. So that is a possible track to follow. Thanks for all your help. Most appreciated. By the way, I'm still wondering what and where I can find the "modulite". This is mentioned as a item to check for a pulse.
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Old 08-29-2013, 02:30 PM   #10
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Don't know if this is the one you are looking for


http://www.amazon.com/Tow-Ready-1191.../dp/B001P2DULI
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