Warner Electric Wheel-Brakes (Std) - Manual (Page 13)

13 Warner Electric • 800-825-9050 819-0514
When the towing vehicle has a 6-volt electrical system,
all brakes will be connected in parallel; therefore, the
total current in the brake circuit should be equal to the
number of brakes times the value given in Table l.
If the towing vehicle has a 12-volt electrical system, all
single axle trailers will be wired in parallel; and the total
current in the brake circuit, should again be equal to
the number of brakes times the value given in Table l.
However, if the trailer is a tandem axle trailer, all brakes
may be wired in parallel or the brakes on each axle
may be wired in series and the axles wired in parallel. If
all brakes on a tandem axle trailer are in parallel. the
total current in the brake circuit should be equal to the
number of brakes times the value given in Table l. If, on
a tandem axle trailer, the brakes on each axle are wired
in series and the axles are wired in parallel, the total
current in the brake circuit should be equal to that of a
single axle trailer wired in parallel.
Figure 3-4
Checking Electrical Connections
Brake Size
AMPS
Brake Size
AMPS
6 Volt 12 Volt 6 Volt
12-1/4 x 5-1/2” 3.7-4.1 3.0-3.7 *16 x 2-1/2” 3.4-3.8
15 x 3” 3.7-4.1 3.0-3.7 *17-1/4 x 3 & 4 3.0-3.4
16-1/2 x 5*, 6*, 7” 3.4-3.8 2.6-3.2 *17-1/4 x 5 4.0-4.5
Table l - (Magnet Current Rating)
* Not in production - service parts only.
If the reading at the controller is higher than the maxi-
mum based on Table l, check for a short in the wiring,
cable, controller, or brake magnets (Figure 3-4). If the
reading at the controller is less than the minimum
based on Table l, check the complete electrical circuit
for loose or dirty connections, broken wires, improper
wire size, and conformity of wiring arrangement with
Warner Wiring Diagrams. If towing vehicle has a 12-volt
electrical system, check to make certain proper exter-
nal resistor is being used. All splices and terminals
should be soldered and ground connections made at
battery or welded to the frame.
Figure 3-5
Checking Amperage at Brake Magnets