Warner Electric 1300-78 User Manual

12 Volt Load Control for Electric

Brake Systems No. 1300-78

P-1385
819-0128

Installation Instructions

The Warner Electric Load Control provides the

Mount on either side

12v
Battery

Stoplight
switch

Utility controller
mounted on dash

Fuse

Red

Blue

Socket

to Stoplight

Starter

Black

10 Gauge Wire

recommended

Load control
1300-78
(Optional)

Typical Wiring Diagram

Warner Load Control 1300-78

capability to properly proportion the braking
power of the trailer brakes to the trailer weight.
The Load Control is a variable resistor which
allows the operator to reduce current flow to the
trailer brakes by turning the control knob.
Depending on road conditions and trailer load,
the knob can be set at any position between
“MIN BRAKE” and “MAX BRAKE”. The Load
Control provides a broad range of adjustment to
suit a wide variety of operating conditions.

Failure to follow these
instructions may result in product damage,
equipment damage, and serious or fatal
injury to personnel.

Specifications

Resistance Rating: 0-5 ohms

Voltage: 12 volts DC

(use only with 12 volt system)

Brake Coil: Designed for 2-4 brakes wired in
parallel, each with 3.0-3.5 ohms coil resistance.

Installation

Mounting the Control

The Load Control should be mounted under
or behind the towing vehicle’s instrument panel
to the left or right of the steering column,
depending on available space and driver
preference.

For under-dash mounting proceed as follows:

1. While holding the Load Control case in
position, mark the underside of the
instrument panel through the two mounting
holes in the case.

2. Drill two 13/64" diameter holes where
marked, being careful not to damage
anything under the instrument panel.

For behind instrument panel mounting proceed
as follows:

1. Position the face of the Load Control shaft
hole and the washer projection hole.

2. Drill a 13/32" diameter hole for the Load
Control shaft and a 3/16" diameter hole for
the washer projection, where marked. Be
careful not to damage anything under the
instrument panel.

Electrical Connection

The Load Control is to be wired in series with
the electric brake controller and the trailer
brakes. Refer to the “Typical Wiring Diagram”
to connect the Load Control into the brake
system. (See Figure 2)

To mount the Load Control, sit in a normal
driving position and place the Control case so
its knob is within easy reach. (See Figure 1)

2

Warner Electric • 800-825-9050 P-1385 • 819-0128

Figure 1

Figure 2