Options for Mating 4-Pole Flat Vehicle Wiring to Jayco 6-Pole Square Trailer Wiring  

Question:

Expert Reply:

The 4-pole to 6-Pole Jayco wiring adapter 30104 supports only the 3 circuits on the 4-pole but converts them to the connector format used on older Jayco trailers. A 4-pole wiring setup has a ground and three circuits; right stop/turn, left stop/turn and tail lights. The Jayco connector has a ground and 5 circuits so using this adapter would let the basic lighting signals from the Explorer's 4-pole reach the trailer but the other functions supported by the Jayco plug would NOT have any signal.

The least-costly way to get 12V power to the trailer connector is to run a length of 10-gauge wire # 10-1-1 from the battery + terminal, through a 40-amp breaker # PK54540 and on to the wire in the trailer's plug that runs to the trailer battery. You'll need ring terminals # 44-5310A. On the trailer's connector you'll need to determine which wire carries 12V power to the trailer battery and splice the 10-gauge wire to that. Then the battery will receive a trickle or maintenance charge as you drive.

Please note that this 12V power feed cannot re-charge a depleted battery; it can only maintain a charged battery. Actual charging needs to come from a shore-power charger like # CTEK56353. I own one of these and mine has worked perfectly during non-stop 24/7/365 operation for almost 4 years.

The other option is to convert the Explorer and trailer to the modern 7-way wiring configuration. To do this on the vehicle you need only kit # ETBC7. This kit has every part needed to install and connect the included 7-way socket which will carry 12V trailer power on the pin at the 1-o-clock position as you view the socket (see photo please). On the trailer you could use 7-way junction box # HS381-9000 to wire in the leads from the trailer's existing wiring to the appropriate terminals inside the box. You will again need ring terminals for the wires on the trailer.

expert reply by: Adam R

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