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Old 05-08-2015, 11:54 PM   #1
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Checking the wires on my RV 7 blade connector

I was looking at my RV 7 blade connector on the back of my RV. All the wires are white. How do you test each connection to determine which wire is connected to each? I have the diagram of what should be connected but would like to verify.
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Old 05-09-2015, 12:00 AM   #2
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VOM or test light. Can get either for $5 or so. The cheapest VOM I have came from Harbor Freight and I got it free with a coupon. Not very good but enough for my uses.
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Old 05-09-2015, 12:07 AM   #3
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VOM or test light. Can get either for $5 or so. The cheapest VOM I have came from Harbor Freight and I got it free with a coupon. Not very good but enough for my uses.
I have a digital volt meter. Do I just need to engage a blinker or brake light and verify which terminal has 12v?
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Old 05-09-2015, 07:03 AM   #4
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noserider, Yes turn each function on one at a time , Running lights, left turn/brake, right turn/brake, and if your coach is wired for it the +12VDC, backup lights and brake controller output. Then with the ohm meter check the ground pin
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Old 05-09-2015, 12:55 PM   #5
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Noserider,
Yes, as has been stated, a physical check of each pin is the sure-fire way of pinpointing (no pun intended) which pin does what.

I also have a 7-pin check plug that I keep with the coach. It simply plugs into the trailer plug on the back of your coach and, you can have a partner perform or, activate each different function from the drivers seat and with the help of a couple of those little FAMILY SERVICE RADIOS you can coordinate and check, all the functions.

Now, that checker, only tells you that the each of the functions, at each pin is working or, not working. But, it won't tell you WHICH pin does what. So, a 12V test light is the easiest tool to use to perform that check. Now, on some, like mine on our '04 Itasca Horizon 36GD with the C-7 330HP CAT, there's an actual diagram of the layout of what each pin does, right on the cover of the 7-pin plug itself. That's really nice to have. The first picture shows the kind that I have and, the second pic shows a combo-7-pin-4-way flat pin checker. My checkers (both 7-pin and 4-way flat) are independent checkers. They are really nice if you just want to do a quick check of all the functions as a pre-flight test or, to see if you have a problem.
Scott



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Old 05-10-2015, 10:42 AM   #6
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Here is a tester for the standard 7 pin connector:
Super price on Innovative of America 7865 at ToolTopia.com

And a test procedure video here:
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Old 05-10-2015, 11:05 AM   #7
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Here is a tester for the standard 7 pin connector:
Super price on Innovative of America 7865 at ToolTopia.com

And a test procedure video here:
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Old 05-10-2015, 01:23 PM   #8
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Thanks Gary. I found that video and watched it. I was looking to test the wires on the RV side to see if they were all located in the right spots.
Then use a test light as has been suggested. Then, compare what you find as the signal from each pin, to my picture I sent you or, whatever diagram applies to your situation.
Scott
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Old 05-10-2015, 08:39 PM   #9
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Thanks guys.
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