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Old 07-13-2021, 08:51 PM   #1
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12V on RV towing 7 pin plug

I have a 2011 Newmar Ventana towing a 2012 GMC Canyon with a BrakeBuddy Select 3 braking system. I am a Newby. I bought the BrakeBuddy system because of the battery charger to keep the Toad battery charged but after hooking it up I find there is no voltage at the designated terminals on the plug on the RV. I see on the wiring diagram from Newmar that the pin at 1 o'clock should be 12V all the time but mine is dead. I have looked all over for a fuse but have been unable to find anything corresponding to that plug. Any offers of help or suggestions will be appreciated.
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Old 07-13-2021, 08:57 PM   #2
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12V on RV towing 7 pin plug

My Newmar supplies 12v power only when the ignition is on or engine running. Have you tried that.

Are you using a voltmeter for tracing voltage from the 7 pin connector to the 6 pin?
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Old 07-14-2021, 07:27 AM   #3
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Just for giggles turn on your coach lights and retest.
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Old 07-14-2021, 07:58 AM   #4
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Maybe this will help. Similar question on a 2019 Venana

https://www.irv2.com/forums/f103/no-...na-439723.html
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Old 07-14-2021, 09:59 PM   #5
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Problem solved!

I should have known that the 12V would only be "hot" when the RV engine is running to prevent something plugged in to that plug from sapping the RV batteries. Duh!! Thanks to all who replied. I hope all my future RV issues are this easy to solve.
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Old 07-15-2021, 08:21 AM   #6
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Quote:
Originally Posted by stargazer1 View Post
I should have known that the 12V would only be "hot" when the RV engine is running to prevent something plugged in to that plug from sapping the RV batteries. Duh!! Thanks to all who replied. I hope all my future RV issues are this easy to solve.
Obviously a different vehicle, but my 2015 Canyon and I am pretty sure my 2020 Silverado, the 12 volt is always hot. (The 2012 Canyon was a totally different design, but still as a caution, your RV and your TOAD may not be wired the same.)

I would have assumed like you that the 12 volt on any 7-pin was always hot. There is protection built in on newer GMs and probably most vehicles, I believe if battery voltage dropped and the onboard sensors detected an issue, various systems get shut down to conserve power. The 12 volt on the 7 pin would likely shut down pretty quickly.
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Old 07-24-2021, 07:25 PM   #7
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I just went through this. Newmar told me the wiring is there but not hooked up. I was told to lokk under the dash for unconnected wires and look for the same colored unconnected wires in the sheathing rigut near the 7 pin connector. The wires are there. Connect one of the wires to the fuse panel and the same colored wire to the 7 pin connector at the one o’clock position. You will need a spade lug and 15 amp fuse for the fuse panel. Again, this is what Wwas told by newmar who, to their credit , responded to my email re this subject by actually calling me. What they told me works.
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