Truck-Lite - Trailing Wiring Specifications

Maximum current carrying capacity

Cable size - Gauge no.
120° F 125° F 150° F
20 Ga. 15 Amps 13 Amps 9 Amps
18 Ga. 18 Amps 15 Amps 11 Amps
16 Ga. 22 Amps> 19 Amps 14 Amps
14 Ga. 27 Amps 23 Amps 17 Amps
12 Ga. 40 Amps 32 Amps 24 Amps
10 Ga. 50 Amps 42 Amps 31 Amps
Note: Amperage rating is based on a 12 volt system operatiing at the listed temperatures.
Currents above these listed in the chart may increase the temperatures of the P.V.C. above a safe design level of 180° F.

SAE J560 Standards

Conductor Id. Wire Color Lamp and Signal Circuits
Wht White Ground return to towing vehicle
Blk Black* Clearance, side marker & license plate lamps
Yel Yellow Left hand turn signal & hazard signal lamps
Red Red Stop lamps and antilock devices
Grn Green Right hand turn signal & hazard signal lamps
Brn Brown* Tail, clearance, side marker lamps & identification lamps
Blu Blue Blue Auxiliary
* It is recommended to balance the circuits as practicable.

Compiled from SAE, TMC and other sources.