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Old 07-31-2012, 09:07 PM   #1
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7 pin to 4 pin wiring

Plugged my toad lights into my motorhome for the first time to find that the motorhome 7 pin was wired incorrectly. Confirmed this by plugging the toad lights into another vehicle and they worked fine. In the process of testing wires, I identified the ground, left turn signal, right turn signal, brake light and running lights on the motorhome. I have all of the wires connected except the brake light wire because I can't figure out where to connect it on the 7 pin. Ideas? Thanks.
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Old 07-31-2012, 10:23 PM   #2
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Trailer Wiring Diagrams | etrailer.com
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Old 08-01-2012, 08:31 AM   #3
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The referenced diagram should help you but on a 4 wire system going to the toad, signal and brake lights are on the same circuit. Do you have seperate bulbs/fillaments on your toad for brake lights. I mean not using the same circuit for signal and brakes.

There are 5 to 4 wire converters available - I know they work from MH to Toad but have not used them the other way. Sounds like you might need a converter if you have a seperate brake circuit from signal lights if you are using 4.wire hookup
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Old 08-01-2012, 11:17 AM   #4
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You do not conect a brake light wire to the 7 pin First it is not a brake light wire (or should not be)

The Brake lights are the right and left turn signals

So the 4 pings are.... (note this is not in pin number order

Ground (That is the odd pin)
Tail/running lights (next to it)
And the other two are Right and Left turn/stop lamps (They are double duty)

No brake or brake light wire on teh flat 4 so the brake lead on the 7 pin, and the battery lead are N/C.
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Old 08-01-2012, 11:24 AM   #5
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Originally Posted by Stump Jumper View Post
I have all of the wires connected except the brake light wire because I can't figure out where to connect it on the 7 pin. Ideas? Thanks.
A standard 7-blade RV-type connector doesn't have a separate brake light wire. Like the 4-pin connector, the brake lights are a function of the left and right turn signal leads. The 3 additional wires over and above those listed for the 4-pin connector are:

1. Trailer BRAKES - this is not a brake light wire, but actuates the brakes on the trailer through a trailer brake controller (if installed) on the tow vehicle

2. Battery +12VDC - this charges the trailer battery that powers the trailer brakes in case of a breakaway situation

3. Auxiliary - the large round center pin, generally used for backup lamps if the trailer is so equipped.

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Old 08-01-2012, 10:08 PM   #6
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OK, now I am confused. The bundle of wires from the motorhome includes 5 wires. One is the ground, one is the left turn signal, one is the right turn signal, one is the running lights and one is the brake lights. My toad lights are LED and use a flat 4 pin connector. I have a 7 pin to 4 pin adapter to connect the two. Is this going to work?
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Old 08-01-2012, 10:54 PM   #7
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My Monaco had amber signal lights and were on a seperate circuit from the red brake lights. There was a 5 to 4 wire converter so the 7 pin connector was wired so a 7 to 4 pin adapter would work.

It may be that your RV has a faulty or missing 5 to 4 wire converter and is therefore not wired for a conventional 4 wire Trailer hookup.

On a 4 wire system the brake and signal lights are on the same wires.
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