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Old 08-15-2018, 06:32 AM   #1
JSpain
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Location: Guymon
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Trailer plug

I'm wanting to put a 4 wire trailer plug at the back
of my 2017 Alpine so I can pull my small 2 man
Boat . Is there a place that is pre-wired to wire in
A trailer lights ? What color wire does what ?

Thanks for any help
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Old 08-15-2018, 06:40 AM   #2
JRTJH
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I haven't seen any Keystone product (that does not come from the factory with a receiver ) that has any provision for wiring a 4 wire plug. There certainly is no "jumper jack" or "wiring connector" under the trailer. On our Cougar, when we installed the receiver, I pulled the coroplast down at the back of the trailer and located the tail/brake light wiring there. On mine, there was no "standard color coding". Typically, there is yellow/brown/green/black wiring, on my Cougar, I found yellow/green/red/white/black wiring. A multimeter is your friend !!!
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Old 08-15-2018, 06:42 AM   #3
chuckster57
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If you go to etrailer on line you can look at the wiring diagrams for the umbilical cord. Those are industry standard. Once the wires hit the junction box at the trailer, all bets are off.

Your best bet is to identify the circuits by taking a rear lights off. Use a test light and energize the circuit at the factory umbilical plug. Just jumper between the 12V and brake/turn signals.
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