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Thread: Trailer wiring - 7 Way

  1. #1
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    Trailer wiring - 7 Way

    eTrailers suggest this wiring diagram for a brake controller. It appears that a solenoid switch is ALSO needed in the black Hot Lead just after the 40 Amp circuit breaker.

    The solenoid will presumably prevent the trailer's accessories from draining the Jeep's battery.

    Is that correct?

    Thanks!

    http://www.etrailer.com/instructions.aspx?pn=ETBC7


  2. #2
    Web Wheeler
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    That's a good idea. It totally sucks when you park at night and the Tow rig battery is as dead as the trailer battery because someone forgot to turn out the lights or turn off the furnace.
    Some people are as useful as a football bat.

  3. The Following User Likes WILLD420's Post:

    CashMoney (February 27th, 2017)

  4. #3
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    Unless you plan on leaving the trailer hooked to the Jeep while camping, you shouldn't have to worry about the trailer draining the Jeeps battery.

    And, if you do leave the trailer hooked, just unplug the wires.
    Here's to a long life and a merry one
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  5. #4
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    I don't see a solenoid in that schematic? I can't say I've ever seen a solenoid wired as you've described. I do like the use of automatic circuit breakers rather than fuses. Unless I just make a quick stop for the night, I always unplug the trailer from the truck. You have to run a LOT of stuff to drain a deep cycle RV battery and the truck battery in 8 hours. Figure out the drain from everything in your trailer and compare that to the output of the RV battery. Remember the battery amp/hour output changes with amp draw. Meaning that the draw at 10 amps isn't half the time as drawing at 5 amps.
    Its just a road with a few rocks, keep driving!

  6. #5
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    Make sure you use a constant duty solenoid, a regular starter solenoid is not designed to be on for extended lengths of time.

  7. The Following User Likes Bob's Post:

    CashMoney (February 27th, 2017)

  8. #6
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    I've done countless installs with the use of a blocking diode. Part number T85HFL40S02 is a good candidate for this function.
    Golden Gate Electronic Repair specializing in the repair, modification and restoration of antique, vintage, and modern electronics.

    Limbonic Audio custom manufacture of hi-end audio electronics.
    Contact Shawn 775-440-1931 or 925-642-9039

  9. The Following User Likes Shawn Trooper's Post:

    CashMoney (February 27th, 2017)

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