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.
2002 Newmar Kountry Star 3669
Freightliner 300HP Cummins
Towing 2005 Jeep Liberty & 2010 Tundra W/Remco DD
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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
Grant & Pat
2014 Adventurer 35P
2012 Jeep Wrangler Rubicon
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.
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)