| 7 Prong Hitch Plug Wiring [message #268562] |
Wed, 31 December 2014 10:12  |
mickey szilagyi
Messages: 273
Registered: January 2013
Karma:
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Senior Member |
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We are in the process of wiring a new 7 prong trailer hitch plug. We will use the OEM wires and circuit that run from the front of the coach for the 4 trailer light wires. These 4 wires are powered through the engine and front battery with a white ground wire. The white ground wire runs from the front of the coach but also has an additional black ground wire to the frame at the back of the coach (this additional ground runs from the OEM connector in the left rear corner of the coach).
We will run a blue wire from the front of the coach to the rear plug for future electric brakes.
We would like to run an additional/separate 12V supply to the 7 prong hitch from the house batteries that will power a dual plug addaptor like this one.
http://www.amazon.com/Reese-Towpower-74681-Power-Adapter/dp/B0016KH24U/ref=sr_1_1?s=automotive&ie=UTF8&qid=1420041235&sr=1-1&keywords= Reese+Towpower+74681+Dual+Port+12+Volt+Power+Adapter
There are 2 extra prongs on the 7 prong plug that we could use as an auxillary separate house battery 12V supply (one hot and one ground). Doing so would keep the two circuits separate with each having its own ground wire. However, the Reese dual power adaptor that plugs into the 7 prong trailer plug is pre-wired to use the same ground post that runs from the front of the coach.
Question - Can we use that same ground post (the one that is connected to the OEM ground) for both the trailer light circuit that is powered by the engine battery and the 12V circuit that would be powered by the house batteries. Basically, both the engine battery and house batteries are grounded to the body and frame so it seems like it would be OK to use the same ground wire for both. Or should we keep them separate as much as possible to prevent a ground loop.
Your suggestions/help/comments on this are greatly appreciated.
Mickey
1977 Kingsley, 403, Lansing, MI
[Updated on: Wed, 31 December 2014 10:13] Report message to a moderator |
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