Installing Brake Controller and 12V Wiring to 7-Way Adapter on 1989 Mallard RV With Dual Batteries

Updated 03/28/2019 | Published 03/26/2019

Products Featured in This Question

Adapter 4-Pole to 7-Pole and 4-Pole

(660)

$61.64

Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot

(323)

$3.60

Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers

(159)

$57.07

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3398)

$119.76

Question:

1989 mallard rv How does the exact wiring go on both batteries under hood

asked by: Joseph

Expert Reply:

Based on your attached photo you are running two 12V batteries in parallel, the second battery is where everything is connected and that positive terminal is where you will want to run the ring terminals and wiring for your brake controller power and 12V power that will eventually run to your 7-way. Because you are asking from the Hopkins adapter # 37185 you will need to use a kit like # 5506 to get the wiring and circuit breakers needed.

If you don't already have that adapter, then I recommend using the kit # ETBC7 that will include the adapter, wiring, connections, circuit breakers, and everything you need to adapt your 4-way to a 7-way with a brake controller. You may need additional wiring like # 10-2-1 if you need more than the 25 feet of wire.

I've attached a wiring diagram and an article to assist.

expert reply by: Jason S