Wiring

[oilman]

First-Thanks for the great explanation, but by 'One' I actually was referring to the Relay to prevent Battery drain.

Sorry I wasn't more specific.

[brian_bp]

.... by 'One' I actually was referring to the Relay to prevent Battery drain.

And so we go from brake controllers to the other aspects of wiring for a trailer, including power and a relay to control it:

More detailed discussion of specific wiring issues:
Power (trailer battery charge) connection

• RV 12V power wire
• 7 pin wiring harness for 2006 Sienna
• how to wire a brake controller

Even the last topic, mainly about brake controller installation, gets into the relay subject.

[Old Crows]

How odd and Co-inky-Dinky!!!!

The left turn signal circuit went out on my ute trailer. Traced it down to a duff converter. Replaced it with a new convert early last week. The Sienna had a both 'flat four' and a "seven pin" connector that looked really nasty so I did some creative 'engineering' and got it down to a one... the seven pin.

I replaced the converter and brought the trailer connector out as far as I could. I spliced the seven pin just ahead of the 'flatty' connector leaving just enough slack to use it as an emergency connect. I capped it with the rubber boot and tucked it up under the valance.

The seven pin, obviously, is for hauling our RV. To haul the 'ute' ... I purchased a 7 pin to flat 4 adapter. The adapter plugs into the 7 pin and the flat four plugs in to it. Neat! Clean! Sweet!!

Bonus Prize!!! The adapter has three LED diagnostic lights that tell you the circuits are working up to the 7 pin plug in.

While at it.... I replaced the oval run/stop/turn lights on the trailer (those oval jobs about 6" long that snap into a rubber gasket..) with some nifty LED jobs from Wally World. WW had the same lights as Tractor Supply... at 1/2 price. Double BONUS!!! They were direct plug ins to the original trailer wiring!!!! No splicing/dicing/cussing the wiring!!! And they look sharp and bright vs the incandescent single bulb OEMs.

[havoc]

hello im new to the site and was wondering if any of you can tell me were is the stop and signal circuits for the first gen. I have no idea how it even looks like.

[brian_bp]

hello im new to the site and was wondering if any of you can tell me were is the stop and signal circuits for the first gen. I have no idea how it even looks like.

For the stop signal to the brake controller, you tap a wire at the switch at the brake pedal... but I don't know which colour for the first generation offhand. See the earlier reply which linked to topics about hooking up a brake controller (and I'm sure there are more recent discussions as well).

For signal circuits, the desire must be to hook up trailer lights - again see the earlier reply which linked to topics about hooking up trailer lighting, and possibly search for newer discussions. The key point is that a ready-made harness is used which plugs in to the Sienna's wiring at the tail lights, so you don't need to know which wire is which.