7-Way Circuit Bench
A complete 7-way RV trailer: all seven pins, tail, stop/turn and reverse lamps, a two-brake axle and the 12V charge line. Brake values follow the manual charts — 3.2 Ω per magnet, 3.0 A per magnet (6.0 A for two) at 12 V. Pin numbers follow SAE J2863; wire colors are the most common RV colors and vary by maker, so always check the harness.
7-WAY CIRCUIT BENCH · TWO-BRAKE AXLE
Symptom: Healthy two-brake trailer. Learn what good readings look like.
PLUG FACE · WIRE SIDE
- 1 Ground · White
- 2 Electric brakes · Blue
- 3 Tail / running · Green
- 4 12V battery charge · Black
- 5 Left turn / stop · Red
- 6 Right turn / stop · Brown
- 7 Reverse / aux · Yellow
----V
Place both probes
Tap a point to place the red probe.
Good system: 3.2 Ω per magnet unplugged (about 1.6 Ω for both on the blue wire), 6.0 A on the blue wire and 3.0 A per magnet at 12 V full gain, over 10.5 V at each magnet.